A327865 Numbers whose arithmetic derivative is a multiple of 5, cf. A003415.

0, 1, 6, 21, 25, 26, 32, 36, 46, 50, 51, 75, 76, 86, 88, 91, 99, 100, 106, 111, 112, 116, 125, 126, 141, 146, 150, 156, 161, 166, 175, 192, 200, 201, 206, 209, 216, 221, 225, 226, 236, 242, 243, 248, 250, 266, 272, 275, 276, 279, 291, 300, 301, 306, 308, 316, 319, 321, 325, 326, 328, 346, 350, 356, 369, 371, 375, 381

Offset

1,3

Links

Antti Karttunen, Table of n, a(n) for n = 1..10000

Prog

(PARI)
A003415(n) = {my(fac); if(n<1, 0, fac=factor(n); sum(i=1, matsize(fac)[1], n*fac[i, 2]/fac[i, 1]))}; \\ From A003415
isA327865(n) = !(A003415(n)%5);
k=1; n=0; while(k<105, if(isA327865(n), print1(n, ", "); k++); n++);

Crossrefs

Cf. A003415, A235992, A327863, A327864, A327935 (a subsequence).

Sequence in context: A323916 A364202 A323917 * A369969 A229498 A164698

Adjacent sequences: A327862 A327863 A327864 * A327866 A327867 A327868

Keyword

nonn

Author

Antti Karttunen, Sep 30 2019

Status

approved