A253052 If, for some m, A098550(m-2) is a prime p and A098550(m) = 3p, add 3p to the sequence.

9, 21, 33, 93, 111, 129, 177, 213, 237, 267, 309, 321, 381, 411, 519, 579, 597, 633, 687, 699, 723, 753, 789, 831, 879, 921, 951, 1047, 1149, 1257, 1299, 1317, 1347, 1401, 1461, 1641, 1713, 1731, 1779, 1797, 1821, 1983, 2031, 2049, 2103, 2181, 2427, 2469

Offset: 1

Author

N. J. A. Sloane, Jan 01 2015

Keywords

• nonn

Comments

A subsequence of A251544 (and of course of A098550).

Crossrefs

Cf. A098550, A251544, A253053, A253054.