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A216147
2*n^n + 1.
4
3, 3, 9, 55, 513, 6251, 93313, 1647087, 33554433, 774840979, 20000000001, 570623341223, 17832200896513, 605750213184507, 22224013651116033, 875787780761718751, 36893488147419103233, 1654480523772673528355, 78692816150593075150849, 3956839311320627178247959
OFFSET
0,1
CROSSREFS
See A216148 for primes in this sequence, A110932 for the corresponding indices.
Sequence in context: A375959 A257623 A257625 * A334774 A257627 A115564
KEYWORD
nonn
AUTHOR
M. F. Hasler, Sep 02 2012
STATUS
approved