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 A349279 #15 Jan 19 2025 11:09:39 %S A349279 1,2,3,4,5,6,7,8,9,24,45,8643024 %N A349279 Fixed points of A349278. %C A349279 This is similar to A349190 but with digits taken in reversed order. %C A349279 If it exists, a(13) > 10^18. - _Max Alekseyev_, Jan 19 2025 %e A349279 24 is a term because A349278(24) = 4*(4+2) = 4*6 = 24. %t A349279 f[n_] := Times @@ Accumulate @ Reverse @ IntegerDigits[n]; Select[Range[100], f[#] == # &] (* _Amiram Eldar_, Nov 13 2021 *) %o A349279 (Python) %o A349279 from math import prod %o A349279 from itertools import accumulate %o A349279 def ok(n): %o A349279 return n == (0 if n%10==0 else prod(accumulate(map(int, str(n)[::-1])))) %o A349279 print([k for k in range(1, 10**7) if ok(k)]) # _Michael S. Branicky_, Nov 13 2021 %Y A349279 Cf. A349190, A349278. %K A349279 nonn,base,more %O A349279 1,2 %A A349279 _Michel Marcus_, Nov 13 2021