A327863 Numbers whose arithmetic derivative is a multiple of 3, cf. A003415.

0, 1, 8, 9, 14, 18, 20, 26, 27, 35, 36, 38, 44, 45, 50, 54, 62, 63, 64, 65, 68, 72, 74, 77, 81, 86, 90, 92, 95, 99, 108, 110, 112, 116, 117, 119, 122, 125, 126, 134, 135, 143, 144, 146, 153, 155, 158, 160, 161, 162, 164, 170, 171, 180, 185, 188, 189, 194, 196, 198, 203, 206, 207, 208, 209, 212, 215, 216, 218, 221, 225

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
isA327863(n) = !(A003415(n)%3);
k=1; n=0; while(k<105, if(isA327863(n), print1(n, ", "); k++); n++);

Crossrefs

Cf. A003415, A235992, A327862, A327864, A327865, A327933 (a subsequence).

Sequence in context: A096784 A175859 A059869 * A213016 A105833 A323249

Adjacent sequences: A327860 A327861 A327862 * A327864 A327865 A327866

Keyword

nonn

Author

Antti Karttunen, Sep 30 2019

Status

approved