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A261579
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Numbers m such that (4^m + 23) / 3 is prime.
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1
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2, 3, 5, 6, 27, 47, 66, 77, 83, 105, 197, 231, 293, 702, 1692, 3021, 6270, 6897, 7733, 14537, 15797, 21083, 21276, 28817, 65430, 111231, 137405, 141017, 185225
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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2 is in the sequence because (4^2 + 23)/3 = 13 is prime.
3 is in the sequence because (4^3 + 23)/3 = 29 is prime.
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MATHEMATICA
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Select[Range[0, 5000], PrimeQ[(4^# + 23)/3] &]
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PROG
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(Magma) [n: n in [0..1500] | IsPrime((4^n+23) div 3)];
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CROSSREFS
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Cf. similar sequences listed in A261539.
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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