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 A180455 #12 Jan 04 2019 20:41:05 %S A180455 79,281,349,439,643,677,787,883,1171,1321,1733,1811,2141,2347,2389, %T A180455 2767,2791,3323,3329,3529,3929,4157,4349,4751,4799,4919,4951,5003, %U A180455 5189,5323,5347,5521,5527,5857,5861,6287,6337,6473,6827,6967,6997,7507,7933,8233 %N A180455 Central term of five successive prime numbers whose average is a prime. %H A180455 Harvey P. Dale, <a href="/A180455/b180455.txt">Table of n, a(n) for n = 1..1000</a> %t A180455 Transpose[Select[Partition[Prime[Range[2500]],5,1],PrimeQ[ Mean[#]]&]] [[3]] (* _Harvey P. Dale_, Oct 30 2011 *) %Y A180455 Cf. A082077. %K A180455 nonn %O A180455 1,1 %A A180455 _Carmine Suriano_, Sep 06 2010