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.

A108604 Squares of the form prime(k)*prime(k+1) + 2*prime(k+1).

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%I A108604 #18 Jan 28 2024 18:10:23
%S A108604 25,49,169,361,961,1849,3721,5329,10609,11881,19321,22801,32761,37249,
%T A108604 39601,52441,58081,73441,80089,97969,121801,177241,187489,214369,
%U A108604 273529,326041,361201,383161,413449,436921,657721,677329,687241,737881,779689
%N A108604 Squares of the form prime(k)*prime(k+1) + 2*prime(k+1).
%C A108604 Squares of greater of twin primes.
%H A108604 Winston de Greef, <a href="/A108604/b108604.txt">Table of n, a(n) for n = 1..10000</a>
%F A108604 a(n) = A006512(n)^2.
%p A108604 ZL:=[]:for p from 1 to 950 do if (isprime(p) and isprime(p+2)) then ZL:=[op(ZL),((p+2)^2)]; fi; od; print(ZL); # _Zerinvary Lajos_, Mar 08 2007
%t A108604 Select[Sqrt/@Table[Prime[k]*Prime[k+1]+2Prime[k+1],{k,160}],IntegerQ]^2 (* _James C. McMahon_, Jan 27 2024 *)
%Y A108604 Cf. A006512, A108570.
%K A108604 easy,nonn
%O A108604 1,1
%A A108604 _Giovanni Teofilatto_, Jul 06 2005
%E A108604 Corrected and extended by _Ray Chandler_, Jul 10 2005