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 A381833 #6 Mar 09 2025 12:57:22 %S A381833 2,6,15,26,35,55,100,126,135,155,200,255,300,400,626,635,655,700,755, %T A381833 800,900,1125,1255,1300,1400,1625,1900,2125,2625,3126,3135,3155,3200, %U A381833 3255,3300,3400,3625,3755,3800,3900,4125,4400,4625,5125,6255,6300,6400,6625,6900,7125 %N A381833 k/25 is in this list if k > 5 and A053824(k) = A112765(k), i.e. if digitsum(k, 5) = valuation(k, 5). %t A381833 Select[Range[25, 180000, 25], DigitSum[#, 5] == IntegerExponent[#, 5] &] / 25 %Y A381833 Cf. A053824, A112765, A381836. %Y A381833 Cf. A381835 (base = 3), A381834 (base = 4). %K A381833 nonn,base %O A381833 1,1 %A A381833 _Peter Luschny_, Mar 09 2025