%I #9 Jun 19 2024 09:32:27
%S 0,3,8,11,13,16,18,21,26,29,31,34,36,39,44,47,49,52,54,57,62,65,67,70,
%T 72,75,80,83,85,88,90,93,98,101,103,106,108,111,116,119,121,124,126,
%U 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
%N Numbers whose primorial base representation has alternating digit sum that is a multiple of 3.
%H Antti Karttunen, <a href="/A373831/b373831.txt">Table of n, a(n) for n = 1..20020</a>
%H <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>
%e 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.
%e A049345(193) = 6201, and the alternating digit sum is (1+2)-(0+6) = -3, thus 193 is included in this sequence.
%o (PARI) isA373831 = A373830;
%Y Cf. A049345, A373605, A373830 (characteristic function).
%K nonn,base
%O 1,2
%A _Antti Karttunen_, Jun 19 2024