A083735 - OEIS

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A083735

Pseudoprimes to bases 3 and 7.

703, 1105, 2465, 10585, 18721, 19345, 29341, 38503, 46657, 50881, 75361, 76627, 88831, 104653, 115921, 146611, 162401, 188191, 213265, 226801, 252601, 278545, 286903, 294409, 314821, 334153, 340561, 359341, 385003, 385201, 399001, 410041 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`R. J. Mathar, Table of n, a(n) for n=1..151` `F. Richman, Primality testing with Fermat's little theorem`
	FORMULA	`a(n) = n-th positive integer k(>1) such that 3^(k-1) = 1 (mod k) and 7^(k-1) = 1 (mod k)` `Intersection of A005935 and A005938. - R. J. Mathar, Apr 05 2011`
	EXAMPLE	`a(1)=703 since it is the first number such that 3^(k-1) = 1 (mod k) and 7^(k-1) = 1 (mod k)`
	CROSSREFS	`Sequence in context: A203350 A035852 A045146 * A161021 A188370 A185571` `Adjacent sequences: A083732 A083733 A083734 * A083736 A083737 A083738`
	KEYWORD	`easy,nonn`
	AUTHOR	`Serhat Sevki Dincer (sevki(AT)ug.bilkent.edu.tr), May 05 2003`

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Last modified February 16 17:48 EST 2012. Contains 205939 sequences.