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%I #7 May 11 2013 11:16:05
%S 2,7,37,36472996377170786527,2954312706550833698779,
%T 3990838394187339929534246675572349035477,
%U 2120895147045314119491609587512844743630072393,228532044137599177017869183161846685251274404207185590172004697234871412029099114059347
%N Primes of the form 3^n+3*n+1.
%C Terms a(9) through a(12) have, respectively, 93, 94, 149, and 156 digits. - _Harvey P. Dale_, May 11 2013
%H Harvey P. Dale, <a href="/A180269/b180269.txt">Table of n, a(n) for n = 1..15</a>
%t Select[Table[3^n+3n+1,{n,0,100}],PrimeQ] (* _Harvey P. Dale_, May 11 2013 *)
%o (PARI) for(i=0,200,x=3^i+3*i+1;if(isprime(x),print1(x", ")))
%Y Cf. A176805, A171058.
%K hard,nonn
%O 1,1
%A Graziano Aglietti (mg5055(AT)mclink.it), Aug 23 2010
%E a(8) from _Harvey P. Dale_, May 11 2013
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