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A094447 Sum of two cubes divisible by 13. 8
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

Select[Union[Total/@(Tuples[Range[30], 2]^3)], Divisible[#, 13]&] (* Vincenzo Librandi, May 08 2013 *)

CROSSREFS

Sequence in context: A020140 A283656 A020194 * A020224 A063519 A075893

Adjacent sequences:  A094444 A094445 A094446 * A094448 A094449 A094450

KEYWORD

nonn,easy

AUTHOR

Jun Mizuki (suzuki32(AT)sanken.osaka-u.ac.jp), Jun 09 2004

STATUS

approved

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Last modified April 28 18:26 EDT 2017. Contains 285579 sequences.