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 A175427 #11 Jan 20 2022 18:16:34 %S A175427 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,27, %T A175427 28,29,30,31,32,33,34,37,38,39,40,41,42,43,44,45,46,47,48,49,50 %N A175427 Starting values which reach a single-digit number after a finite number of iterations of the map x->A175429(x). %C A175427 Arguments m such that A175424(m) >= 0. Also arguments m such that A175419(m) >= 0. %C A175427 Complement of A175426. %e A175427 27 is in the sequence because a single-digit number is reached in 3 iterations: 7^2 = 49, 9^4 = 6561, ((1^6)^5)^6 = 1, so A175424(27) = 3. %Y A175427 Cf. A175419, A175420, A175421, A175422, A175423, A175424, A175425, A175426. %K A175427 nonn,base,more %O A175427 1,3 %A A175427 _Jaroslav Krizek_, May 09 2010