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A344263
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Numbers m such that 3^(2m+1) - 3^m + 1 is prime.
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1
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0, 3, 4, 11, 35, 56, 88, 104, 476, 1367, 1707, 2472, 22232, 25260
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OFFSET
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1,2
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COMMENTS
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a(14) > 30000.
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LINKS
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MAPLE
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for m from 0 to 3000 do if isprime(3^(2*m + 1) - 3^m + 1) then print(m); end if; end do;
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MATHEMATICA
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Do[If[PrimeQ[3^(2 m + 1) - 3^m + 1], Print[m]], {m, 0, 3000}]
Select[Range[0, 2500], PrimeQ[3^(2#+1)-3^#+1]&] (* Harvey P. Dale, Mar 01 2023 *)
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PROG
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(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)
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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