

A058775


Numbers n such that n * 2^(n/2)  1 is prime.


0



2, 6, 8, 20, 54, 68, 468, 648, 1100, 1374, 14072, 17790, 20038, 27192, 42692
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OFFSET

1,1


REFERENCES

Posting to NMBRTHRY(AT)LISTSERV.NODAK.EDU by Mike Oakes Dec 30 2000 entitled "Gaussian analogues of the Cullen and Woodall primes."


LINKS

Table of n, a(n) for n=1..15.
Index entries for Gaussian integers and primes


MATHEMATICA

Do[ If[ PrimeQ[n*2^(n/2)  1], Print[n] ], {n, 1, 100000} ]
Select[Range[2, 43000, 2], PrimeQ[#*2^(#/2)1]&] (* Harvey P. Dale, Dec 13 2018 *)


PROG

(PARI) is(n)=isprime(n*2^(n/2)1) \\ Charles R Greathouse IV, Jun 13 2017


CROSSREFS

Sequence in context: A289095 A290160 A290213 * A103023 A111247 A045656
Adjacent sequences: A058772 A058773 A058774 * A058776 A058777 A058778


KEYWORD

nonn,easy


AUTHOR

Robert G. Wilson v, Jan 02 2001


STATUS

approved



