id:A083736 - OEIS Search Results

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Pseudoprimes to bases 2,5 and 7.

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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; listen)

	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)`
	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)`
	PROGRAM	`Assembly`
	CROSSREFS	`Sequence in context: A110889 A063400 A141706 this_sequence A006931 A097061 A139089` `Adjacent sequences: A083733 A083734 A083735 this_sequence 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 December 15 00:47 EST 2009. Contains 170825 sequences.

AT&T Labs Research