Search: id:A028871
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%I A028871
%S A028871 2,7,23,47,79,167,223,359,439,727,839,1087,1223,1367,1847,2207,2399,
%T A028871 3023,3719,3967,4759,5039,5623,5927,7919,8647,10607,11447,13687,
%U A028871 14159,14639,16127,17159,18223,19319,21023,24023,25919,28559,29927
%N A028871 Primes of form n^2 - 2.
%C A028871 Except for the initial term, primes equal to the product of two consecutive 
               even numbers minus 1. - Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), 
               Sep 24 2004
%D A028871 D. Shanks, Solved and Unsolved Problems in Number Theory, 2nd. ed., Chelsea, 
               1978, p. 31.
%H A028871 P. De Geest, <a href="http://www.worldofnumbers.com/consemor.htm">Palindromic 
               Quasipronics of the form n(n+x)</a>
%H A028871 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Near-SquarePrime.html">Near-Square Prime</a>
%e A028871 a(3) = 23, 6^2 - 2*6 - 1 = 23
%t A028871 lst={};Do[s=n^2;If[PrimeQ[p=s-2], AppendTo[lst, p]], {n, 6!}];lst [From 
               Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 26 2008]
%Y A028871 Cf. A028870.
%Y A028871 Sequence in context: A049552 A049572 A094786 this_sequence A053705 A049001 
               A049002
%Y A028871 Adjacent sequences: A028868 A028869 A028870 this_sequence A028872 A028873 
               A028874
%K A028871 nonn
%O A028871 1,1
%A A028871 Patrick De Geest (pdg(AT)worldofnumbers.com)

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