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 A188283 #28 Dec 19 2024 10:07:38
%S A188283 0,1,2,10,11,145,154,223,232,322,405,415,450,451,504,514,540,541,569,
%T A188283 596,659,695,956,965,1023,1032,1123,1132,1203,1213,1223,1230,1231,
%U A188283 1232,1302,1312,1320,1321,1322,1449,1494,1569,1596,1659,1695,1944,1956,1965,2003
%N A188283 Numbers k such that iterations for the map r -> A061602(r) starting with k ends with a fixed point (factorions A014080).
%C A188283 If k is a term, then (10^k - 1)/9 is also a term. - _Jinyuan Wang_, Nov 07 2020
%e A188283 Number 405 is in sequence because 405 -> 145 -> 145 -> ...
%o A188283 (PARI) is(k) = {my(t=k, v=List([k])); while(t=sum(i=1, #d=digits(t), d[i]!), if(t==v[#v], return(1), if(sum(i=1, #v-1, t==v[i]), return(0))); listput(v, t)); } \\ _Jinyuan Wang_, Nov 07 2020
%Y A188283 Supersequence of A014080 (factorions).
%Y A188283 Cf. A061602, A173447, A188284.
%K A188283 nonn,base
%O A188283 1,3
%A A188283 _Jaroslav Krizek_, Mar 26 2011
%E A188283 Missing terms a(1) and a(8)-a(10) added by _Jaroslav Krizek_, Jan 28 2012
%E A188283 Name corrected and more terms from _Jinyuan Wang_, Nov 07 2020