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 A094150 #10 Jun 26 2025 14:52:45 %S A094150 5,13,12,3,11,10,15,3,14,3,5,18,13,4,18,18,5,2,4,3,12,10,21,12,18,16, %T A094150 11,19,20,4,6,12,13,6,6,5,3,16,5,12,12,11,18,16,18,17,12,5,12,12,18, %U A094150 19,14,4,5,12,18,10,16,6,13,17,21,19,6,13,19,4,3,7,15,10,21,4,18,3,5,20,11,18 %N A094150 Number of iterations of the sum of digits of the divisors of R(n) needed to reach 15, where R(n) = A002275. %e A094150 a(9)=3 because 111111111 -> 151 -> 8 -> 15. %e A094150 a(1) does not exist because 1 -> 1 and never reaches 15. %Y A094150 Cf. A002275, A034690, A086793. %K A094150 less,nonn,base %O A094150 2,1 %A A094150 _Jason Earls_, Jun 01 2004 %E A094150 More terms from _David Wasserman_, May 22 2007