This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A381034 #15 Feb 17 2025 12:00:36 %S A381034 15,20,25,45,50,55,63,75,80,85,91,98,105,110,115,126,135,140,145,165, %T A381034 170,175,182,189,195,200,205,225,230,235,255,260,265,273,285,290,295, %U A381034 301,308,315,320,325,336,345,350,355,375,380,385,392,399,405,410,415,429,435,440,445,451,465,470,475,483,495,500,505 %N A381034 Numbers that have a digit > 1 in their primorial base expansion, and that are multiples of the corresponding radix prime of the least significant such digit. %H A381034 Antti Karttunen, <a href="/A381034/b381034.txt">Table of n, a(n) for n = 1..20000</a> %H A381034 <a href="/index/Pri#primorialbase">Index entries for sequences related to primorial base</a>. %e A381034 A049345(15) = 211, the least significant digit larger than one is 2, where the corresponding radix prime is 5, and 5 divides 15, therefore 15 is included. %o A381034 (PARI) is_A381034 = A381033; %Y A381034 Cf. A049345, A381032, A381033 (characteristic function), A381037 (subsequence). %Y A381034 Subsequence of the intersection A177711 and A381035. %K A381034 nonn %O A381034 1,1 %A A381034 _Antti Karttunen_, Feb 17 2025