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A111974 Primes of the form 2*3^k + 1. 8
3, 7, 19, 163, 487, 1459, 39367, 86093443, 258280327, 411782264189299, 116299474006080119380780339, 3140085798164163223281069127, 84782316550432407028588866403, 20602102921755074907947094535687 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..14.

Hartosh Singh Bal and Gaurav Bhatnagar, Prime number conjectures from the Shapiro class structure, arXiv:1903.09619 [math.NT], 2019.

MATHEMATICA

Select[2*3^Range[100]+1, PrimeQ]

CROSSREFS

Cf. A003306 (k such that 2*3^k + 1 is prime), A003307 (k such that 2*3^k - 1 is prime).

Sequence in context: A245723 A118128 A113875 * A243100 A173400 A281971

Adjacent sequences:  A111971 A111972 A111973 * A111975 A111976 A111977

KEYWORD

nonn

AUTHOR

T. D. Noe, Aug 24 2005

STATUS

approved

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Last modified January 20 10:31 EST 2022. Contains 350471 sequences. (Running on oeis4.)