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A216148
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Primes of the form 2*k^k + 1 = A216147(k).
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13
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OFFSET
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1,1
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COMMENTS
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The sequence should be extended through A110932, which lists the corresponding values of k: The next term, 2*251^251 + 1 = A216147(A110932(4)) ~ 4.16*10^602, is too large to include here.
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LINKS
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FORMULA
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MATHEMATICA
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Select[Table[2n^n+1, {n, 20}], PrimeQ] (* Harvey P. Dale, Mar 27 2016 *)
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PROG
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(PARI) for(n=1, 999, ispseudoprime(p=n^n*2+1) & print1(p", "))
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CROSSREFS
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A subsequence of A133663, with b=a and c=1.
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KEYWORD
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nonn,bref,less
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AUTHOR
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STATUS
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approved
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