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 A102658 Numbers which are the sum of two positive cubes and divisible by 31. 6
 217, 341, 1395, 1674, 1736, 2728, 4123, 5425, 5642, 5859, 6293, 7471, 7657, 8029, 8587, 9207, 9269, 9331, 10261, 11160, 11377, 12679, 12896, 13392, 13888, 14167, 14911, 15841, 16120, 17577, 17701, 19747, 20026, 21824, 21979, 24149, 24397 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA upto[n_] := Block[{t}, Union@ Reap[ Do[If[Mod[t = x^3 + y^3, 31] == 0, Sow@t], {x, n^(1/3)}, {y, Min[x, (n - x^3)^(1/3)]}]][[2, 1]]]; upto[24500] (* Giovanni Resta, Jun 12 2020 *) CROSSREFS Cf. A003325, A101421 (divisible by k=7), A101852 (k=11), A094447 (k=13), A099178 (k=17), A102619 (k=19), A101806 (k=23), A224483 (k=29), A102618 (k=37). Sequence in context: A204765 A289302 A288847 * A145732 A038594 A020232 Adjacent sequences:  A102655 A102656 A102657 * A102659 A102660 A102661 KEYWORD nonn,easy AUTHOR Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Feb 02 2005 STATUS approved

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Last modified September 26 01:25 EDT 2020. Contains 337346 sequences. (Running on oeis4.)