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A369656
Numbers k such that k' is odd and also k'' is odd, where k' stands for the arithmetic derivative of k, A003415(k).
2
6, 10, 22, 27, 30, 34, 42, 50, 58, 66, 70, 78, 82, 86, 99, 105, 114, 118, 122, 125, 126, 130, 142, 146, 154, 165, 174, 182, 194, 202, 206, 207, 214, 222, 230, 231, 238, 242, 243, 246, 250, 255, 273, 274, 279, 282, 285, 286, 298, 302, 310, 318, 326, 333, 343, 345, 346, 357, 358, 366, 369, 370, 374, 382, 385, 386
OFFSET
1,1
COMMENTS
Numbers k that are in A235991 and also A003415(k) is in A235991.
PROG
(PARI) \\ See A369655.
CROSSREFS
Cf. A000035, A003415, A068346, A235991, A351228, A369655 (characteristic function).
Sequence in context: A083285 A082419 A102783 * A365064 A157037 A189992
KEYWORD
nonn
AUTHOR
Antti Karttunen, Feb 05 2024
STATUS
approved