%I A089682
%S A089682 2,11,47,107,191,431,587,971,1451,2027,2351,2699,3467,4799,5807,6911,
%T A089682 7499,8111,8747,10091,10799,14699,15551,16427,17327,18251,25391,27647,
%U A089682 36299,41771,44651,55487,57131,62207,67499,71147,74891,80687,92927
%N A089682 Primes of the form 3n^2 - 1.
%C A089682 431 and 27647 also have the form 2n^3-1 (431=3x12^2-1=2x6^3-1 and 27647=3x96^2-1=2x24^3-1). 
               [From Howard Berman (howard_berman(AT)hotmail.com), May 09 2009]
%C A089682 Primes p such that 3*(p+1) is square [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), 
               Aug 03 2009]
%D A089682 M. Cerasoli, F. Eugeni and M. Protasi, Elementi di Matematica Discreta, 
               Bologna 1988
%D A089682 Emanuele Munarini and Norma Zagaglia Salvi, Matematica Discreta,UTET, 
               CittaStudiEdizioni, Milano 1997
%Y A089682 Sequence in context: A140305 A142346 A106980 this_sequence A050929 A019005 
               A112288
%Y A089682 Adjacent sequences: A089679 A089680 A089681 this_sequence A089683 A089684 
               A089685
%K A089682 easy,nonn
%O A089682 1,1
%A A089682 Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Jan 05 2004
%E A089682 More terms from Rick L. Shepherd (rshepherd2(AT)hotmail.com), May 18 
               2005