The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139243 Second differences of Mersenne numbers A001348, divided by 4. 5
5, 18, 456, 1056, 29184, 67584, 1867776, 130154496, 270532608, 33420214272, 481573208064, 1133871366144, 31336081391616, 2183630092763136, 139646772820574208, 290482175965396992, 35884681830888112128, 517085294816170868736, 1217485108864830406656 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Paolo Xausa, Table of n, a(n) for n = 1..450
FORMULA
a(n) = A139241(n)/4 = A139242(n)/2.
MATHEMATICA
Differences[2^Prime[Range[25]]-1, 2]/4 (* Paolo Xausa, Oct 20 2023 *)
CROSSREFS
Cf. A001348, A139237, A139239, A139240, A139241, A139242.
Sequence in context: A203180 A359616 A359560 * A347670 A139237 A317541
Adjacent sequences: A139240 A139241 A139242 * A139244 A139245 A139246
KEYWORD
easy,nonn
AUTHOR
Omar E. Pol, Apr 19 2008
EXTENSIONS
More terms from Alois P. Heinz, Mar 13 2020
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 4 03:29 EDT 2024. Contains 373089 sequences. (Running on oeis4.)