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!)
A139303
a(n) = (2^(2p - 1)/16)-1, where p is the n-th Mersenne prime A000668(n).
11
1, 511, 144115188075855871, 904625697166532776746648320380374280103671755200316906558262375061821325311
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..4.
FORMULA
a(n) = (2^(2*A000668(n)-1)/16)-1 = (A139294(n)/16)-1.
MATHEMATICA
a[n_] := 2^(2^(MersennePrimeExponent[n] + 1) - 7) - 1; Array[a, 4] (* Amiram Eldar, Jul 10 2025 *)
CROSSREFS
Cf. A000668, A139294, A139295, A139296, A139297, A139298, A139299, A139300, A139301, A139302, A139304, A139305, A139306.
Sequence in context: A069436 A217915 A263167 * A354537 A035884 A035596
Adjacent sequences: A139300 A139301 A139302 * A139304 A139305 A139306
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 18:28 EDT 2026. Contains 395802 sequences.
License Agreements, Terms of Use, Privacy Policy