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A192764 Numbers n such that 2^(n-1)+2*n-1 is a prime number. 1
1, 2, 6, 14, 66, 86, 230, 2006, 3876, 3920, 5418, 8820 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

MATHEMATICA

Select[Range[4000], PrimeQ[2^(# - 1) + 2# - 1] &] (* Alonso del Arte, Jul 09 2011 *)

PROG

(PARI)  for(n=1, 10^6, if(ispseudoprime(2^(n-1)+2*n-1), print1(n, ", ")));

CROSSREFS

Cf. A004051, A163115, A176691, A192436.

Sequence in context: A188491 A295974 A324365 * A055691 A072171 A308568

Adjacent sequences:  A192761 A192762 A192763 * A192765 A192766 A192767

KEYWORD

nonn

AUTHOR

Juri-Stepan Gerasimov, Jul 09 2011

STATUS

approved

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Last modified July 29 12:51 EDT 2021. Contains 346346 sequences. (Running on oeis4.)