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A096723 Numbers n such that 3^n has the form 2p-+1 where p is prime. 1
1, 2, 3, 4, 7, 13, 16, 32, 64, 71, 103, 541, 1091, 1367, 1627, 4177, 9011, 9551, 36913, 43063, 49681, 57917, 483611, 877843 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

For the corresponding primes p see A088553.

For n > 1, numbers n such that (3^n + (-1)^n)/2 is prime. - Thomas Ordowski, Dec 26 2016

LINKS

Table of n, a(n) for n=1..24.

MATHEMATICA

Select[Range[4200], Or@@PrimeQ[(3^#+{1, -1})/2]&] (* Harvey P. Dale, Mar 05 2013 *)

CROSSREFS

Sequence in context: A200088 A004783 A031149 * A266498 A137495 A099779

Adjacent sequences:  A096720 A096721 A096722 * A096724 A096725 A096726

KEYWORD

nonn

AUTHOR

Lekraj Beedassy, Jul 05 2004

EXTENSIONS

More terms from Ray Chandler, Jul 09 2004

STATUS

approved

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Last modified October 15 05:43 EDT 2019. Contains 328026 sequences. (Running on oeis4.)