A222306 Numbers k such that 4k is in A045980.

0, 2, 4, 7, 14, 16, 18, 31, 32, 38, 52, 54, 56, 70, 74, 79, 86, 108, 112, 117, 122, 126, 128, 130, 144, 151, 182, 189, 196, 234, 247, 248, 250, 252, 254, 256, 266, 268, 304, 326, 333, 338, 364, 367, 378, 416, 430, 432, 434, 436, 448, 486, 500, 511, 515, 518, 542, 549, 556, 558, 560, 592, 632, 635, 662, 670, 679, 682

Offset: 1

Author

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

Keywords

• nonn

Links

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

Crossrefs

Cf. A045980, A222304, A222305.

Programs

PARI

T=thueinit('z^3+1);is(n)=n==0 || #thue(T, 4*n)>0 \\ Charles R Greathouse IV, Nov 29 2014