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A331205
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a(n) = least prime of the form 2^m - 2^n + 1.
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3
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2, 3, 5, 549755813881, 17, 97, 193, 140737488355201, 257, 7681, 15361, 134215681, 12289, 8380417, 114689
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OFFSET
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0,1
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COMMENTS
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a(15) = 2^447 - 2^15 + 1 is too large to be represented in the data.
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LINKS
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Hugo Pfoertner, Table of n, a(n) for n = 0..62
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EXAMPLE
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See A331204.
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PROG
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(PARI) for(n=0, 14, for(m=n+1, oo, k=2^m-2^n+1; if(isprime(k), print1(k, ", "); break)))
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CROSSREFS
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Cf. A181692, A331204 (corresponding values of m).
Sequence in context: A305192 A141186 A078682 * A075174 A075176 A134972
Adjacent sequences: A331202 A331203 A331204 * A331206 A331207 A331208
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KEYWORD
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nonn
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AUTHOR
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Hugo Pfoertner, Jan 12 2020
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STATUS
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approved
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