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A086678 Numbers n such that 1 + Sum_{k=1..n} 2k^5 is a prime. 1

%I

%S 1,2,8,9,11,20,27,36,41,42,71,77,86,95,105,110,113,132,134,137,138,

%T 147,149,155,183,186,189,201,209,210,212,215,218,222,230,245,258,261,

%U 278,309,317,329,336,341,347,359,371,377,380,389,411,413,417,425,432,435

%N Numbers n such that 1 + Sum_{k=1..n} 2k^5 is a prime.

%F (2*n^6+6*n^5+5*n^4-n^2+6)/6 is prime.

%e Sum(k=1,2,2k^5)+1 = 2*1^5+2*2^5 + 1 = 67 is a prime so 2 belongs to the sequence.

%Y A091872 gives corresponding primes.

%K nonn,easy

%O 1,2

%A _Yalcin Aktar_, Jul 28 2003

%E More terms from _Ray Chandler_, Aug 07 2003

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Last modified October 4 06:54 EDT 2022. Contains 357237 sequences. (Running on oeis4.)