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A128067
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Numbers n such that (3^n + 7^n)/10 is prime.
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8
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OFFSET
| 1,1
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COMMENTS
| All terms are primes.
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MATHEMATICA
| k=7; Do[ p=Prime[n]; f=(3^p+k^p)/(k+3); If[ PrimeQ[f], Print[p]], {n, 1, 100} ]
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CROSSREFS
| 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, A128068, A128069, A128070, A128071, A128072, A128073, A128074, A128075. Cf. A059801 = numbers n such that 4^n - 3^n is prime. Cf. A121877 = numbers n such that (5^n - 3^n)/2 is a prime. Cf. A128024, A128025, A128026, A128027, A128028, A128029, A128030, A128031, A128032.
Sequence in context: A107689 A154834 A159047 * A052493 A061938 A168375
Adjacent sequences: A128064 A128065 A128066 * A128068 A128069 A128070
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KEYWORD
| hard,more,nonn
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AUTHOR
| Alexander Adamchuk (alex(AT)kolmogorov.com), Feb 14 2007
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EXTENSIONS
| More terms from Ryan Propper (rpropper(AT)stanford.edu), Apr 02 2007
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