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Search: id:A128075
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| A128075 |
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Numbers n such that (3^n + 19^n)/22 is prime. |
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+0
9
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OFFSET
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1,1
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COMMENT
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All terms are primes.
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MATHEMATICA
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k=19; Do[ p=Prime[n]; f=(3^p+k^p)/(k+3); If[ PrimeQ[f], Print[p]], {n, 1, 100} ]
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CROSSREFS
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Cf. A007658 = numbers n such that (3^n + 1)/4 is prime. Cf. A057469 = numbers n such that (3^n + 2^n)/5 is prime. Cf. A122853 = numbers n such that (3^n + 5^n)/8 is prime. Cf. A128066, A128067, A128068, A128069, A128070, A128071, A128072, A128073, A128074. Cf. A059801 = numbers n such that 4^n - 3^n is prime. Cf. A121977 = numbers n such that (5^n - 3^n)/2 is a prime. Cf. A128024, A128025, A128026, A128027, A128028, A128029, A128030, A128031, A128032.
Adjacent sequences: A128072 A128073 A128074 this_sequence A128076 A128077 A128078
Sequence in context: A120307 A022915 A093883 this_sequence A106883 A037209 A105430
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KEYWORD
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hard,more,nonn
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AUTHOR
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Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 14 2007
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