A359821 Numbers k whose arithmetic derivative, A003415(k), has the opposite parity to k.

1, 2, 6, 9, 10, 14, 15, 18, 21, 22, 25, 26, 30, 33, 34, 35, 38, 39, 42, 46, 49, 50, 51, 54, 55, 57, 58, 62, 65, 66, 69, 70, 74, 77, 78, 81, 82, 85, 86, 87, 90, 91, 93, 94, 95, 98, 102, 106, 110, 111, 114, 115, 118, 119, 121, 122, 123, 126, 129, 130, 133, 134, 135, 138, 141, 142, 143, 145, 146, 150, 154

Offset

1,2

Links

Table of n, a(n) for n=1..71.

Prog

(PARI) isA359821(n) = A359820(n);

Crossrefs

Cf. A003415, A359820 (characteristic function), A359822 (complement).

Positions of odd terms in A129283 and in A168036.

Sequence in context: A350944 A016726 A360136 * A047396 A276936 A276937

Adjacent sequences: A359818 A359819 A359820 * A359822 A359823 A359824

Keyword

nonn,easy

Author

Antti Karttunen, Jan 14 2023

Extensions

Name edited by Peter Munn, Jan 14 2023

Status

approved