cp's OEIS Frontend

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.

A110013 Squares of the form 4p + 5, where p is a prime.

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%I A110013 #15 Jan 22 2020 06:13:36
%S A110013 25,49,81,121,169,289,361,441,529,729,961,1089,1521,1681,1849,2401,
%T A110013 2809,3249,3721,3969,5041,5929,6241,6889,7921,8281,8649,9409,10201,
%U A110013 11449,11881,12321,12769,14161,14641,16641,17161,17689,18769,19881,23409
%N A110013 Squares of the form 4p + 5, where p is a prime.
%C A110013 The sequence contain all squares of greater of twin primes.
%H A110013 Amiram Eldar, <a href="/A110013/b110013.txt">Table of n, a(n) for n = 1..10000</a>
%F A110013 a(n) = 4*A002327(n) + 5 = A088502(n)^2.
%t A110013 Select[4#+5&/@Prime[Range[900]],IntegerQ[Sqrt[#]]&]  (* _Harvey P. Dale_, Jan 29 2011 *)
%Y A110013 Cf. A002327, A002328, A088502.
%Y A110013 Cf. A108604.
%K A110013 easy,nonn
%O A110013 1,1
%A A110013 _Giovanni Teofilatto_, Sep 03 2005
%E A110013 Corrected and extended by _Ray Chandler_, Sep 04 2005