A083736 - OEIS

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A083736

Pseudoprimes to bases 2,5 and 7.

561, 29341, 46657, 75361, 115921, 162401, 252601, 294409, 314821, 334153, 340561, 399001, 410041, 488881, 512461, 530881, 552721, 656601, 658801, 710533, 721801, 852841, 1024651, 1141141, 1152271, 1168513, 1193221, 1461241, 1569457, 1615681 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`R. J. Mathar, Table of n, a(n) for n=1..81` `F. Richman, Primality testing with Fermat's little theorem`
	FORMULA	`a(n) = n-th positive integer k(>1) such that 2^(k-1) = 1 (mod k), 5^(k-1) = 1 (mod k) and 7^(k-1) = 1 (mod k)` `Intersection of A083732 and A005938. Intersection of A083733 and A005936. - R. J. Mathar, Apr 05 2011`
	EXAMPLE	`a(1)=561 since it is the first number such that 2^(k-1) = 1 (mod k), 5^(k-1) = 1 (mod k) and 7^(k-1) = 1 (mod k)`
	CROSSREFS	`Sequence in context: A205947 A063400 A141706 * A006931 A097061 A139089` `Adjacent sequences: A083733 A083734 A083735 * A083737 A083738 A083739`
	KEYWORD	`easy,nonn`
	AUTHOR	`Serhat Sevki Dincer (sevki(AT)ug.bilkent.edu.tr), May 05 2003`

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Last modified February 16 06:46 EST 2012. Contains 205867 sequences.