close
login
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139302
a(n) = 2^(2p - 1)/16, where p is the n-th Mersenne prime A000668(n).
11
2, 512, 144115188075855872, 904625697166532776746648320380374280103671755200316906558262375061821325312
(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)/16 = A139294(n)/16.
MATHEMATICA
a[n_] := 2^(2^(MersennePrimeExponent[n] + 1) - 7); Array[a, 4] (* Amiram Eldar, Jul 10 2025 *)
CROSSREFS
Cf. A000668, A139294, A139295, A139296, A139297, A139298, A139299, A139300, A139301, A139303, A139304, A139305, A139306.
Sequence in context: A109111 A004886 A234606 * A003391 A294276 A320520
Adjacent sequences: A139299 A139300 A139301 * A139303 A139304 A139305
KEYWORD
nonn
AUTHOR
Omar E. Pol, Apr 13 2008
EXTENSIONS
a(4) from Amiram Eldar, Jul 10 2025
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified May 21 17:30 EDT 2026. Contains 395799 sequences.
License Agreements, Terms of Use, Privacy Policy