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A344263 Numbers m such that 3^(2m+1) - 3^m + 1 is prime. 1
0, 3, 4, 11, 35, 56, 88, 104, 476, 1367, 1707, 2472, 22232, 25260 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(14) > 30000.

LINKS

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

MAPLE

for m from 0 to 3000 do if isprime(3^(2*m + 1) - 3^m + 1) then print(m); end if; end do;

MATHEMATICA

Do[If[PrimeQ[3^(2 m + 1) - 3^m + 1], Print[m]], {m, 0, 3000}]

PROG

(PARI) for(m=0, 3e3, if(isprime(3^(2*m+1)-3^m+1), print1(m", ")))

(SageMath)

for m in range(3000):

    if is_prime(3^(2*m + 1) - 3^m + 1):

        print(m)

CROSSREFS

Cf. A344170.

Sequence in context: A084378 A038559 A242044 * A275309 A119042 A042273

Adjacent sequences:  A344260 A344261 A344262 * A344264 A344265 A344266

KEYWORD

nonn,more

AUTHOR

Reza K Ghazi, May 13 2021

STATUS

approved

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Last modified September 24 06:04 EDT 2021. Contains 347623 sequences. (Running on oeis4.)