Greatest x that is a solution to x-phi(x)=n or zero if there is no solution, where phi(x) is Euler's totient function.
4, 9, 8, 25, 10, 49, 16, 27, 0, 121, 22, 169, 26, 55, 32, 289, 34, 361, 38, 85, 30, 529
2 seqfan posts
Mon Mar 15 14:57:05 CET 2010 [seqfan] Re: Highly cototient numbers