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A139295
a(n) = 2^(2p - 1)-1, where p is the n-th Mersenne prime A000668(n).
12
31, 8191, 2305843009213693951, 14474011154664524427946373126085988481658748083205070504932198000989141204991
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..4.
FORMULA
a(n) = 2^(2*A000668(n)-1)-1 = A139294(n)-1.
MATHEMATICA
a[n_] := 2^(2^(MersennePrimeExponent[n] + 1) - 3) - 1; Array[a, 4] (* Amiram Eldar, Jul 10 2025 *)
CROSSREFS
Cf. A000668, A139294, A139296, A139297, A139298, A139299, A139300, A139301, A139302, A139303, A139304, A139305, A139306.
Sequence in context: A136676 A135811 A119598 * A261947 A069451 A374668
Adjacent sequences: A139292 A139293 A139294 * A139296 A139297 A139298
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 13 2008
STATUS
approved

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Last modified May 21 18:11 EDT 2026. Contains 395802 sequences.
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