A287634 Ulam numbers k such that 4*k and 16*k are also Ulam numbers.

1, 324, 1296, 1858, 2630, 2814, 3451, 4905, 6366, 7258, 7322, 8754, 8966, 9980, 10655, 10779, 10909, 11881, 12248, 13609, 13917, 14769, 14904, 16502, 17281, 17303, 18923, 18943, 19598, 19852, 20284, 21342, 21904, 22012, 24367, 25425, 25814, 27607, 27908, 28729

Offset: 1

Author

Enrique Navarrete, May 28 2017

Keywords

• nonn

Crossrefs

Cf. A002858, A287612.

Extensions

a(11)-a(40) from Giovanni Resta, May 31 2017