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 A094447 Numbers which are the sum of two positive cubes and divisible by 13. 9
 65, 91, 351, 468, 520, 559, 637, 728, 793, 1001, 1027, 1339, 1456, 1547, 1729, 1755, 2457, 2808, 3718, 3744, 3887, 4160, 4394, 4472, 4706, 4914, 4940, 5096, 5642, 5824, 6175, 6344, 7163, 7202, 7371, 7657, 8008, 8125, 8190, 8216, 9009 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 EXAMPLE Sums not divisible by 13 are shown in asterisks: ....|...1....8...27...64...125...216...343...512...729..1000..1331 ------------------------------------------------------------------ 1...|...*....*....*...65.....*.....*.....*.....*.....*..1001.....* 8...|...*....*....*....*.....*.....*...351...520.....*.....*..1339 27..|...*....*....*...91.....*.....*.....*.....*.....*..1027.....* 64..|..65....*...91....*.....*.....*.....*.....*...793.....*.....* 125.|...*....*....*....*.....*.....*...468...637.....*.....*..1456 216.|...*....*....*....*.....*.....*...559...728.....*.....*..1547 343.|...*..351....*....*...468...559.....*.....*.....*.....*.....* 512.|...*..520....*....*...637...728.....*.....*.....*.....*.....* 729.|...*....*....*..793.....*.....*.....*.....*.....*..1729.....* 1000|1001....*.1027....*.....*.....*.....*.....*..1729.....*.....* 1331|...*.1339....*....*..1456..1547.....*.....*.....*.....*.....* MATHEMATICA upto[n_] := Block[{t}, Union@ Reap[ Do[If[Mod[t = x^3 + y^3, 13] == 0, Sow@t], {x, n^(1/3)}, {y, Min[x, (n - x^3)^(1/3)]}]][[2, 1]]]; upto[10^4] (* Giovanni Resta, Jun 12 2020 *) CROSSREFS Sequence in context: A020140 A283656 A020194 * A020224 A063519 A299456 Adjacent sequences: A094444 A094445 A094446 * A094448 A094449 A094450 KEYWORD nonn,easy AUTHOR Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Jun 09 2004 EXTENSIONS Definition corrected by Robert Israel, Jun 12 2020 STATUS approved

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Last modified June 4 10:51 EDT 2023. Contains 363121 sequences. (Running on oeis4.)