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A275528

Prime factors of numbers of the form 4^(2^m) - 2^(2^m) + 1 with m >= 0.

3, 13, 97, 193, 241, 673, 769, 12289, 786433, 22253377, 39714817, 152371201, 597688321, 1107296257, 3221225473, 7348420609, 11560943617, 29796335617, 74490839041, 77309411329, 206158430209, 246423748609, 448203325441, 2422022479873, 5469640851457, 28114855919617

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OFFSET

1,1

COMMENTS

Primes p other than 3 such that one third of the multiplicative order of 2 (mod p) is a power of 2.

Primes in A255772 (except 7), sorted.

LINKS

Arkadiusz Wesolowski, Table of n, a(n) for n = 1..27

Anders Björn and Hans Riesel, Factors of generalized Fermat numbers, Math. Comp. 67 (1998), no. 221, pp. 441-446.

Anders Björn and Hans Riesel, Table errata to “Factors of generalized Fermat numbers”, Math. Comp. 74 (2005), no. 252, p. 2099.

Anders Björn and Hans Riesel, Table errata 2 to "Factors of generalized Fermat numbers", Math. Comp. 80 (2011), pp. 1865-1866.

EXAMPLE