The On-Line Encyclopedia of Integer Sequences (OEIS)

Revision History for A242770 (Bold, blue-underlined text is an addition; faded, red-underlined text is a ~~deletion~~.)
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A242770

Composite numbers of the form A242490(n) - 1.
(history; published version)

#10 by Joerg Arndt at Mon Sep 22 11:37:18 EDT 2014

STATUS

reviewed

approved

#9 by Michel Marcus at Mon Sep 22 11:19:39 EDT 2014

STATUS

proposed

reviewed

#8 by Hiroaki Yamanouchi at Mon Sep 22 11:17:24 EDT 2014

STATUS

editing

proposed

#7 by Hiroaki Yamanouchi at Mon Sep 22 11:15:44 EDT 2014

DATA

4189, 12193, 641941, 8778073, 26822599, 11488195489

COMMENTS

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

EXAMPLE

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

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

EXTENSIONS

a(6) from Hiroaki Yamanouchi, Sep 22 2014

STATUS

approved

editing

#6 by N. J. A. Sloane at Tue May 27 00:34:33 EDT 2014

STATUS

proposed

approved

#5 by Vladimir Shevelev at Thu May 22 08:05:23 EDT 2014

STATUS

editing

proposed

#4 by Vladimir Shevelev at Thu May 22 08:05:16 EDT 2014

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.

AUTHOR

Vladimir Shevelev, and _Peter J. C. Moses_, May 22 2014

STATUS

proposed

editing

#3 by Vladimir Shevelev at Thu May 22 07:55:36 EDT 2014

STATUS

editing

proposed

#2 by Vladimir Shevelev at Thu May 22 07:54:53 EDT 2014

NAME

allocated for Vladimir ShevelevComposite numbers of the form A242490(n) - 1.

DATA

4189, 12193, 641941, 8778073, 26822599

OFFSET

1,1

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.

CROSSREFS

Cf. A242489, A242490, A242716.

KEYWORD

allocated

nonn,new,more,changed

AUTHOR

Vladimir Shevelev, May 22 2014

STATUS

approved

editing

#1 by Vladimir Shevelev at Thu May 22 07:54:53 EDT 2014

NAME

allocated for Vladimir Shevelev

KEYWORD

allocated

STATUS

approved