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!)
A242770 Composite numbers of the form A242490(n) - 1. 1
4189, 12193, 641941, 8778073, 26822599, 11488195489 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(7) (if it exists) = A242490(k) - 1, k >= 5 * 10^7. - Hiroaki Yamanouchi, Sep 22 2014

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

a(1) = A242490(16) - 1 = 4189 = 59 * 71;

a(2) = A242490(21) - 1 = 12193 = 89 * 137;

a(3) = A242490(125) - 1 = 641941 = 727 * 883;

a(4) = A242490(417) - 1 = 8778073 = 2927 * 2999;

a(5) = A242490(675) - 1 = 26822599 = 5081 * 5279;

a(6) = A242490(10171) - 1 = 11488195489 = 107183 * 107183.

CROSSREFS

Cf. A242489, A242490, A242716.

Sequence in context: A290846 A236805 A202530 * A234723 A152511 A252316

Adjacent sequences:  A242767 A242768 A242769 * A242771 A242772 A242773

KEYWORD

nonn,more

AUTHOR

Vladimir Shevelev and Peter J. C. Moses, May 22 2014

EXTENSIONS

a(6) from Hiroaki Yamanouchi, Sep 22 2014

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 January 25 01:49 EST 2020. Contains 331229 sequences. (Running on oeis4.)