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A108062
Numbers n such that 2^(2n-1) + 2^n + 1 is prime.
1
1, 2, 3, 6, 10, 15, 79, 82, 142, 190, 499, 5071, 7350
OFFSET
1,2
COMMENTS
Next term >= 10^4. - Jeppe Stig Nielsen, Mar 28 2014
FORMULA
A006599(n) = a(n) - 1.
MATHEMATICA
Do[ If[ PrimeQ[2^(2n - 1) + 2^n + 1], Print[n]], {n, 5500}] (* Robert G. Wilson v, Jun 03 2005 *)
PROG
(PARI) is(n)=ispseudoprime(2^(2*n-1)+2^n+1) \\ Charles R Greathouse IV, Jun 12 2017
CROSSREFS
Cf. A138576.
Sequence in context: A048681 A375972 A051891 * A347117 A269403 A075623
KEYWORD
base,nonn
AUTHOR
Alexandre Wajnberg, Jun 02 2005
EXTENSIONS
a(1) and a(12) from Robert G. Wilson v, Jun 03 2005
a(13) = 7350 from Jeppe Stig Nielsen, Mar 28 2014
STATUS
approved