A155886 Least k such that 2^(2^k) = n (mod k).

1, 3, 14, 11, 6, 1941491, 10, 83, 31, 13, 123, 35, 71, 27, 34913, 241, 18, 8059, 34, 349, 44, 25, 39, 100867561, 76, 231, 253, 66203, 57, 227, 139, 45, 184, 37, 111, 97, 55, 41, 103, 1099, 81, 66791, 53

Offset: 0

Author

T. D. Noe, Jan 29 2009

Keywords

• nonn
• more

Comments

First occurrence of n in sequence A155836.

a(43) > 12500000. - Tyler Busby, Mar 15 2024

Crossrefs

Cf. A015910 (2^n mod n), A036236, A155836.