A250483 Numbers of the form 3^x + y^3 with x, y >= 0.

1, 2, 3, 4, 9, 10, 11, 17, 27, 28, 30, 35, 36, 54, 65, 67, 73, 81, 82, 89, 91, 108, 126, 128, 134, 145, 152, 206, 217, 219, 225, 243, 244, 251, 270, 297, 307, 344, 346, 352, 368, 370, 424, 459, 513, 515, 521, 539, 586, 593, 729, 730, 732, 737, 738, 755, 756

Offset

1,2

Comments

No terms are congruent to 5 or 7 (mod 8): subsequence of A047420.

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..2500

Example

17 is in this sequence because 3^2+2^3=17.
91 is in this sequence because 3^3+4^3=91.

Mathematica

nn=15; Union[Select[Flatten[Table[3^x + y^3, {x, 0, nn}, {y, 0, nn}]], #<=nn^3 &]]

Crossrefs

Cf. A047420.

Cf. similar sequences listed in A250482.

Sequence in context: A284681 A309346 A047339 * A294485 A332772 A084368

Adjacent sequences: A250480 A250481 A250482 * A250484 A250485 A250486

Keyword

nonn

Author

Vincenzo Librandi, Nov 25 2014

Status

approved