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 A219505 #6 Nov 21 2012 19:33:09 %S A219505 79,281,295,329,349,355,403,439,511,643,677,685,787,805,841,887,949, %T A219505 963,1171,1179,1195,1241,1327,1339,1397,1435,1463,1503,1547,1641,1685, %U A219505 1717,1733,1779,1811,1917,1957,1991,2033,2061,2141,2147,2347,2389,2395,2433 %N A219505 Numbers that are arithmetic mean of 5 successive primes. %H A219505 Zak Seidov, <a href="/A219505/b219505.txt">Table of n, a(n) for n = 1..1000</a> %e A219505 a(1) = A219478(1) = 79 = (prime(20)+...+prime(24))/5 = (71+ 73+ 79+ 83+ 89)/5. %t A219505 Select[(Mean /@ Partition[Prime[Range[1000]], 5, 1]), IntegerQ] %Y A219505 A219478 is subsequence. %K A219505 nonn %O A219505 1,1 %A A219505 _Zak Seidov_, Nov 21 2012