login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A139233 Second differences of perfect numbers A000396, divided by 2. 10
223, 3582, 16767288, 4261388256, 60146251776, 1152921370926219264, 1329227995784915870021503368556314624, 95780971304118050988940697472320075563727548890218496 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

FORMULA

a(n) = A139230(n)/2.

CROSSREFS

Cf. A000396, A139228, A139229, A139230, A139231, A139232, A139234, A139235, A139236, A139237.

Sequence in context: A205273 A205266 A152834 * A205265 A153165 A094491

Adjacent sequences:  A139230 A139231 A139232 * A139234 A139235 A139236

KEYWORD

nonn

AUTHOR

Omar E. Pol, Apr 19 2008

EXTENSIONS

a(5)-a(8) from Jinyuan Wang, Mar 04 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified April 21 10:58 EDT 2021. Contains 343150 sequences. (Running on oeis4.)