login
A122138
Indices k such that A122136(k) is a prime.
3
1, 2, 3, 4, 6, 8, 10, 11, 12, 14, 15, 18, 20, 22, 23, 26, 27, 32, 36, 38, 39, 40, 44, 47, 48, 50, 51, 52, 54, 55, 56, 58, 59, 60, 64, 66, 68, 71, 72, 74, 76, 78, 80, 83, 84, 86, 88, 89, 90, 92, 94, 95, 96, 98, 100, 102, 103, 107, 108, 110, 112, 114, 116, 118, 120, 122, 126
OFFSET
1,2
COMMENTS
The corresponding primes are listed in A122139.
MATHEMATICA
Select[Range[200], PrimeQ[Numerator[Sum[Prime[k]^2, {k, 1, #1}]/Product[Prime[k], {k, 1, #1}]]]&]
KEYWORD
nonn
AUTHOR
Alexander Adamchuk, Aug 21 2006
STATUS
approved