b21 := (1,3,6,11,19)(2,4,8,14,24)(5,9,16,27,43)(7,12,21,34,54)(10,17,29,46,72) (13,22,36,57,89)(15,25,40,63,99)(18,30,48,75,79)(20,32,51,80,122)(23,37, 59,92,139)(26,41,65,102,154)(28,44,69,107,162)(31,49,77,118,178)(33,52, 82,124,187)(35,55,86,130,197)(38,60,94,142,213)(39,61,96,145,218)(42,66, 58,90,136)(45,70,109,164,246)(47,73,113,170,256)(50,78,120,181,271)(53, 83,126,190,283)(56,87,132,199,297)(62,97,147,221,327)(64,100,151,227,336) (67,104,157,236,349)(68,105,159,239,353)(71,110,166,249,365)(74,114,172, 259,380)(76,116,175,263,387)(81,123,185,144,216)(84,127,192,286,417)(85, 128,194,289,422)(88,133,201,300,424)(91,137,206,307,444)(93,140,210,313, 453)(95,143,215,319,461)(98,148,223,330,474)(101,152,229,339,486)(103, 155,233,344,476)(106,160,241,356,508)(108,158,237,351,502)(111,167,251, 368,521)(112,168,253,371,525)(115,173,261,383,541)(117,176,265,390,551) (119,179,269,395,560)(121,182,273,400,567)(125,188,280,410,370)(129,195, 291,425,598)(131,198,295,189,281)(134,202,302,183,274)(135,203,304,439, 617)(138,207,309,446,625)(141,211,315,454,633)(146,219,324,466,559)(149, 224,332,477,359)(150,225,169,254,373)(153,230,341,489,669)(156,234,346, 497,679)(161,242,357,510,655)(163,244,360,411,581)(165,247,364,516,699) (171,257,377,533,718)(174,262,385,544,731)(177,266,391,553,741)(180,270, 396,562,750)(184,275,403,570,473)(186,277,406,574,556)(191,284,414,585, 774)(193,287,419,591,781)(196,292,427,600,791)(200,298,432,608,802)(205, 305,441,620,819)(208,310,448,228,337)(209,311,450,630,828)(212,316,456, 636,834)(214,318,459,317,457)(217,321,463,644,845)(220,325,468,649,852) (222,328,472,654,859)(226,334,480,661,668)(231,342,491,672,793)(232,343, 493,674,877)(235,347,418,589,779)(238,352,503,685,323)(240,354,505,688, 892)(243,358,511,693,901)(245,361,482,664,869)(248,255,374,529,713)(250, 366,518,683,888)(252,369,523,592,782)(258,378,535,721,933)(260,381,524, 707,917)(264,388,548,736,948)(267,392,555,744,958)(268,393,557,746,961) (272,398,564,753,967)(276,404,331,475,657)(278,407,576,765,980)(279,408, 578,767,984)(282,375,530,715,927)(285,415,587,776,994)(288,420,593,783, 1001)(290,423,596,786,1004)(293,428,602,794,1012)(294,296,430,605,799) (299,433,610,804,1021)(301,435,613,808,1025)(303,437,616,813,807)(306, 442,622,821,438)(308,421,465,647,850)(312,451,338,484,666)(314,394,558, 748,729)(320,462,642,842,662)(322,464,646,848,1063)(326,469,651,716,928) (329,449,628,515,697)(333,478,659,864,1076)(335,481,663,868,1081)(340, 487,386,545,733)(345,495,676,881,488)(348,499,681,886,1095)(350,501,682, 887,532)(355,506,690,895,1103)(362,513,604,797,443)(363,514,696,906,1111) (367,519,573,762,977)(372,526,710,921,763)(376,531,471,653,857)(379,536, 723,935,979)(382,539,727,941,1144)(384,542,656,860,1072)(389,549,738,951, 671)(397,563,751,554,742)(399,565,755,969,1168)(401,568,758,971,1170) (402,512,694,903,624)(405,572,761,975,1173)(409,579,768,986,500)(412,582, 770,920,1126)(413,583,712,924,1131)(416,588,778,997,673)(426,599,789, 1007,1197)(429,603,796,1014,1202)(431,606,492,479,660)(434,611,639,837, 861)(436,614,810,1026,483)(440,618,816,571,760)(445,623,822,1037,1219) (447,626,825,1039,1116)(452,631,829,1044,1225)(455,634,832,546,734)(458, 638,836,872,1084)(460,640,839,1053,1233)(467,504,686,889,1097)(470,652, 855,1068,607)(485,667,873,1009,1101)(490,670,875,1088,1253)(494,675,879, 905,678)(496,677,882,1002,757)(498,680,885,1093,983)(507,691,897,1105, 1260)(509,692,899,528,621)(517,700,909,1096,973)(520,703,913,1104,974) (522,705,878,1006,1196)(527,711,923,1129,1023)(534,719,930,1135,991)(537, 724,876,795,1013)(538,725,938,1141,580)(540,728,942,1146,1286)(543,584, 772,990,1184)(547,735,947,1151,1289)(550,739,953,1156,1149)(552,740,954, 1158,1290)(561,619,817,1032,1216)(566,756,641,840,1054)(569,759,972,1172, 1285)(575,764,978,1175,1180)(577,766,982,1177,1302)(586,775,992,1186,981) (590,780,937,1040,1221)(594,784,999,752,965)(595,785,800,1017,1152)(597, 737,949,601,792)(609,803,1019,643,843)(612,806,1024,856,1069)(615,811, 932,1137,1283)(627,826,957,689,893)(629,827,1041,1223,1201)(632,830,1045, 1120,1272)(635,833,726,939,963)(637,835,1050,1226,896)(645,846,1060,1174, 940)(648,809,812,1028,773)(650,853,1066,1242,1331)(658,862,1074,1247, 1335)(665,870,944,1148,1287)(684,884,1091,1110,815)(687,890,1098,1258, 1157)(695,904,1109,1263,1265)(701,910,1115,1268,1036)(702,911,1117,1145, 1034)(704,914,1043,1218,1049)(706,915,1121,1239,1329)(708,918,1124,1275, 1333)(709,919,1071,1246,1188)(714,926,854,1067,1087)(717,847,1061,866, 1078)(720,931,1136,1282,1301)(722,934,1138,1284,1324)(730,943,1147,970, 1169)(732,945,976,966,1165)(743,956,1160,1062,1114)(745,959,929,1134, 1281)(747,962,1163,1294,1166)(749,964,1164,1295,1100)(754,968,1090,1255, 1339)(769,987,1181,1304,1143)(771,989,1059,838,1052)(777,995,1133,798, 1016)(787,788,1005,1183,1127)(790,1008,1198,867,1079)(801,1018,1027,1212, 1205)(805,1022,1209,1317,955)(814,1029,1213,1320,849)(818,1033,1217,1322, 1338)(820,1035,1132,1193,880)(823,1038,1220,1257,1057)(824,891,1099,1080, 946)(831,1046,1227,1305,1155)(841,1055,844,1058,1238)(851,1064,1240,1330, 1222)(858,907,1112,1264,1130)(863,1075,1248,1337,1296)(865,1077,1249, 1195,1312)(871,1083,1234,1321,1354)(874,1086,1252,1273,1350)(883,1042, 1065,985,1179)(894,1102,1259,1343,1361)(898,1106,1171,1299,1031)(900, 1030,1214,1314,1340)(902,1108,922,1128,1278)(908,1113,1266,916,1122)(912, 1118,1270,1348,1308)(925,1125,1276,1336,1344)(936,993,1187,1307,952)(950, 1154,1051,1230,1231)(960,1162,1293,1237,1094)(988,1182,1306,1347,1176) (996,1190,1048,1229,1215)(998,1191,1309,1357,1300)(1000,1192,1159,1291, 1328)(1003,1194,1311,1342,1365)(1010,1199,1315,1235,1178)(1015,1203,1139, 1200,1303)(1020,1208,1279,1210,1142)(1047,1228,1326,1056,1236)(1070,1245, 1334,1359,1362)(1073,1241,1204,1316,1360)(1082,1250,1089,1254,1327)(1085, 1251,1119,1271,1349)(1092,1256,1341,1363,1207)(1107,1262,1345,1325,1185) (1123,1274,1224,1323,1189)(1140,1280,1167,1297,1355)(1150,1288,1211,1318, 1353)(1153,1269,1346,1232,1298)(1161,1277,1351,1364,1356)(1243,1332,1352, 1244,1310)(1261,1292,1319,1313,1358);