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 A251101 #6 Nov 30 2014 16:59:15 %S A251101 1,2,3,2,3,2,3,2,5,2,5,2,5,2,7,2,3,2,3,2,3,11,13,3,2,3,2,3,2,17,2,5,2, %T A251101 5,2,5,2,7,2,7,2,3,19,2,5,2,3,2,3,2,23,2,5,2,3,2,3,2,3,2,29,31,2,3,2, %U A251101 3,2,7,2,7,2,7,2,7,2,5,2,3,37,2,3,2,3,2 %N A251101 Smallest prime factor of A098550(n). %C A251101 a(n) = A020639(A098550(n)). %H A251101 Reinhard Zumkeller, <a href="/A251101/b251101.txt">Table of n, a(n) for n = 1..10000</a> %o A251101 (Haskell) %o A251101 a251101 = a020639 . fromIntegral . a098550 %Y A251101 Cf. A020639, A098550, A251103, A158478. %K A251101 nonn %O A251101 1,2 %A A251101 _Reinhard Zumkeller_, Nov 30 2014