A242770 - OEIS

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A242770

Composite numbers of the form A242490(n) - 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`

Last modified August 13 02:09 EDT 2020. Contains 336441 sequences. (Running on oeis4.)