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

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

Cf. A049345, A373605, A373830 (characteristic function).

Sequence in context: A243169 A366582 A051245 * A265897 A003157 A310281

Adjacent sequences: A373828 A373829 A373830 * A373832 A373833 A373834

Keyword

nonn,base

Author

Antti Karttunen, Jun 19 2024

Status

approved