b21 := (1,3,7,11,17,26,40,62,95,2,5)(4,6,9,13,21,32,49,76,117,179,220)(8,12,19,
     28,44,68,104,160,243,358,491)(10,15,22,34,53,81,125,192,291,144,219)(14,
     16,24,36,57,87,134,206,307,272,324)(18,27,42,64,99,152,230,339,92,94,145)
     (20,30,45,70,108,165,251,355,357,490,601)(23,35,55,83,129,198,118,181,
     273,400,523)(25,38,58,89,138,211,315,425,551,316,452)(29,31,47,72,112,
     171,260,383,510,614,678)(33,51,77,119,183,277,406,59,90,140,213)(37,39,
     60,91,142,96,147,223,327,395,520)(41,63,97,148,225,331,308,442,560,600,
     677)(43,66,100,154,234,344,477,588,552,214,216)(46,71,110,167,255,376,
     288,290,426,141,215)(48,74,113,173,264,388,180,182,275,402,526)(50,52,79,
     121,187,283,415,116,177,269,396)(54,82,127,194,295,292,427,470,139,212,
     317)(56,85,130,200,252,371,370,487,403,405,529)(61,93,143,218,323,450,
     568,642,712,553,580)(65,67,102,156,238,350,482,592,458,574,319)(69,106,
     161,245,362,493,441,443,562,525,623)(73,75,115,175,268,394,518,619,691,
     749,624)(78,120,185,279,410,535,240,353,276,404,527)(80,123,188,285,419,
     189,286,421,547,297,434)(84,86,132,202,153,232,340,471,581,658,626)(88,
     136,207,309,444,528,625,126,193,293,428)(98,150,226,333,466,157,159,241,
     354,488,598)(101,155,236,346,284,417,543,274,401,524,621)(103,158,239,
     352,486,596,569,548,644,303,437)(105,107,163,247,366,499,604,680,738,750,
     754)(109,166,253,372,351,484,593,671,650,622,698)(111,169,256,377,506,
     608,685,732,714,300,302)(114,174,266,390,312,314,451,422,549,199,301)
     (122,124,190,287,423,133,204,227,334,387,515)(128,196,296,433,557,586,
     665,730,713,429,431)(131,201,304,235,345,479,420,546,643,294,430)(135,
     137,209,311,448,414,541,172,262,384,511)(146,221,325,455,571,651,718,591,
     669,440,399)(149,151,228,335,432,555,646,612,690,748,676)(162,246,364,
     495,474,476,587,667,645,715,760)(164,249,367,500,416,418,545,186,281,411,
     537)(168,170,258,379,507,610,688,747,773,781,436)(176,178,271,398,522,
     620,696,752,662,728,542)(184,278,408,531,629,229,337,468,195,197,298)
     (191,289,424,208,310,446,564,631,704,478,589)(203,205,224,329,459,575,
     655,722,666,731,550)(210,313,449,544,640,407,530,627,700,460,576)(217,
     321,454,561,649,597,675,222,326,457,521)(231,233,342,473,584,663,639,711,
     759,578,438)(237,348,412,538,637,254,374,481,532,534,632)(242,356,489,
     599,572,565,653,636,708,504,503)(244,360,270,397,320,322,456,447,566,536,
     634)(248,250,369,502,605,681,739,753,763,778,635)(257,378,343,475,585,
     664,641,280,282,413,539)(259,381,508,611,689,736,720,633,706,363,494)
     (261,263,386,513,615,693,683,741,768,729,710)(265,389,462,577,656,723,
     673,735,567,540,638)(267,392,516,616,694,742,769,765,757,359,361)(299,
     435,558,594,672,734,719,701,756,467,514)(305,439,559,606,682,740,767,746,
     772,463,465)(306,328,330,461,445,563,652,628,702,332,464)(318,453,570,
     647,716,609,686,744,670,573,519)(336,338,469,579,657,617,695,751,687,745,
     703)(341,472,582,659,724,705,347,349,409,533,630)(365,497,603,679,737,
     766,770,779,783,785,790)(368,501,483,485,595,674,654,721,761,777,786)
     (373,375,480,590,668,733,717,660,725,762,709)(380,382,509,613,692,699,
     755,774,782,788,602)(385,512,554,556,648,583,661,727,707,758,775)(391,
     393,517,618,697,726,764,776,784,789,492)(496,498,505,607,684,743,771,780,
     787,791,792);