A202277 - OEIS

A202277

Numbers m such that number of integers k such sigma(k) <= m (A074753) is equal to number of integers k <= m such that sigma(x) = k has no solution (A202276).

%I #7 Mar 30 2012 19:00:28

%S 2,537,639,647,653,655,657,661,663,672,674,684,686

%N Numbers m such that number of integers k such sigma(k) <= m (A074753) is equal to number of integers k <= m such that sigma(x) = k has no solution (A202276).

%C Numbers m such that A074753(m) - A202276(m) = 0.

%C Numbers m such that A202275(m) = 0 (see graph of A202275).

%C Conjecture: sequence is finite with 13 terms.

%Y Cf. A074753, A202275, A202276, A175523, A007369, A007368, A007609.

%K nonn

%O 1,1

%A _Jaroslav Krizek_, Dec 25 2011