A369656 Numbers k such that k' is odd and also k'' is odd, where k' stands for the arithmetic derivative of k, A003415(k).

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.

Links

Table of n, a(n) for n=1..66.

Prog

(PARI) \\ See A369655.

Crossrefs

Cf. A000035, A003415, A068346, A235991, A351228, A369655 (characteristic function).

Sequence in context: A083285 A082419 A102783 * A365064 A157037 A189992

Adjacent sequences: A369653 A369654 A369655 * A369657 A369658 A369659

Keyword

nonn

Author

Antti Karttunen, Feb 05 2024

Status

approved