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 A175209 #3 Mar 30 2012 18:35:52 %S A175209 1,16,64,512,1024,6561,16384,32768,531441,2097152,4194304,33554432, %T A175209 67108864,387420489,3486784401,8589934592,17179869184,34359738368, %U A175209 274877906944,549755813888,7625597484987,22876792454961,70368744177664 %N A175209 Numbers n such that bigomega(bigomega(n)) ^ bigomega(n) = n. %C A175209 bigomega(.) = A001222(.). %C A175209 There exists an infinity of solutions n of the form n = q^p, where q is prime, bigomega(q^p)= p, and bigomega(p)= q, if we select, for example, p = 2^q. %C A175209 The first solution with q=5 is n=5^32, the first solution with q=7 is n=7^128. %e A175209 With n = 16 = 2^4, bigomega(16)= 4, bigomega(4)= 2,and 2^4 = 16. %e A175209 With n = 531441=3^12, bigomega(3^12)= 12, bigomega(12)= 3,and 3^12 = 531441. %p A175209 with(numtheory): for n from 1 to 1000000000 do: if bigomega(bigomega(n))^bigomega(n)= n then print(n) : fi: od : %Y A175209 Cf. A001222, A167746. %K A175209 nonn %O A175209 1,2 %A A175209 _Michel Lagneau_, Mar 05 2010 %E A175209 Unspecific references and unrelated cross-references removed - _R. J. Mathar_, Mar 21 2010