A373831 - OEIS

A373831

Numbers whose primorial base representation has alternating digit sum that is a multiple of 3.

0, 3, 8, 11, 13, 16, 18, 21, 26, 29, 31, 34, 36, 39, 44, 47, 49, 52, 54, 57, 62, 65, 67, 70, 72, 75, 80, 83, 85, 88, 90, 93, 98, 101, 103, 106, 108, 111, 116, 119, 121, 124, 126, 129, 134, 137, 139, 142, 144, 147, 152, 155, 157, 160, 162, 165, 170, 173, 175, 178, 180, 183, 188, 191, 193, 196, 198, 201, 206, 209, 212

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..20020

Index entries for sequences related to primorial base

EXAMPLE

A049345(3) = 11, and the alternating digit sum is A373605(3) = 1-1 = 0, and as zero is a multiple of 3, 3 is included in this sequence.

A049345(193) = 6201, and the alternating digit sum is (1+2)-(0+6) = -3, thus 193 is included in this sequence.

PROG

(PARI) isA373831 = A373830;

CROSSREFS