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 A186963 #14 Jun 02 2025 03:57:25 %S A186963 2,2,2,3,4,3,4,5,4,4,6,5,6,7,6,7,6 %N A186963 Number of prime factors in the expansion of the infinitary perfect number A007357(n) over distinct terms of A050376. %C A186963 The total number of factors in the decomposition of A007357(n) in terms of A050376 is A187043(n). The subset of factors which are ordinary primes are counted here. %F A186963 a(n) = A162642(A007357(n)). - R. J. Mathar, Mar 30 2011 %e A186963 The unique expansion of A007357(2)= 60 as a product of terms of A050376 is 3*4*5. Two of these factors, namely 3 and 5, are primes (A000040), so a(2)=2. %Y A186963 Cf. A007357, A050376, A187043 %K A186963 nonn %O A186963 1,1 %A A186963 _Vladimir Shevelev_, Mar 02 2011