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A331205
a(n) = least prime of the form 2^m - 2^n + 1.
3
2, 3, 5, 549755813881, 17, 97, 193, 140737488355201, 257, 7681, 15361, 134215681, 12289, 8380417, 114689
OFFSET
0,1
COMMENTS
a(15) = 2^447 - 2^15 + 1 is too large to be represented in the data.
LINKS
EXAMPLE
See A331204.
PROG
(PARI) for(n=0, 14, for(m=n+1, oo, k=2^m-2^n+1; if(isprime(k), print1(k, ", "); break)))
CROSSREFS
Cf. A181692, A331204 (corresponding values of m).
Sequence in context: A305192 A141186 A078682 * A075174 A075176 A134972
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Jan 12 2020
STATUS
approved