A222304 Numbers k such that 2k is in A045980.

0, 1, 4, 8, 13, 14, 27, 28, 32, 36, 49, 62, 63, 64, 76, 104, 108, 109, 112, 125, 140, 148, 158, 171, 172, 185, 193, 216, 224, 234, 244, 252, 256, 260, 288, 301, 302, 343, 351, 364, 365, 378, 392, 427, 433, 468, 494, 496, 500, 504, 508, 512, 532, 536, 589, 603, 608, 652, 665, 666, 676, 679, 728, 729, 734, 756, 769, 832

Offset: 1

Author

N. J. A. Sloane, Feb 15 2013, based on a suggestion from Allan C. Wechsler

Keywords

• nonn

Comments

Numbers k such that 2k = x^3 + y^3 for some integers x, y. - Charles R Greathouse IV, Nov 29 2014

Links

• Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A045980, A222305, A222306.

Programs

PARI

T=thueinit('z^3+1);
is(n)=n==0 || #thue(T, 2*n)>0 \\ Charles R Greathouse IV, Nov 29 2014