login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A039656 Becomes prime after n iterations of f(x) = sigma(x)-1 (least inverse of A039655). 8
2, 6, 4, 27, 12, 9, 121, 301, 930, 484, 578, 441, 1273, 468, 4863, 3171, 9216, 8373, 19692, 19416, 25442, 13440, 19230, 16641, 16804, 83161, 100652, 226181, 203400, 133200, 419248, 380979, 744796, 553296, 634710, 539476, 505584, 674416, 634206 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Robert G. Wilson v and Charles R Greathouse IV, Table of n, a(n) for n = 0..100 (terms up to 66 from Wilson)

CROSSREFS

Cf. A039649-A039655.

Sequence in context: A106831 A038212 A092399 * A263326 A226532 A006233

Adjacent sequences:  A039653 A039654 A039655 * A039657 A039658 A039659

KEYWORD

nonn

AUTHOR

David W. Wilson

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified August 22 22:36 EDT 2017. Contains 290952 sequences.