id:A083733 - OEIS Search Results

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Pseudoprimes to bases 2 and 7.

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561, 1105, 2465, 3277, 8321, 10585, 18721, 29341, 46657, 62745, 75361, 104653, 115921, 162401, 219781, 226801, 252601, 278545, 294409, 314821, 334153, 340561, 399001, 410041, 449065, 488881, 512461, 530881, 534061, 552721, 574561, 587861 (list; graph; listen)

	OFFSET	`1,1`
	LINKS	`R. J. Mathar, Table of n, a(n) for n=1..138` `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) and 7^(k-1) = 1 (mod k)`
	EXAMPLE	`a(1)=561 since it is the first positive integer k(>1) which satisfies 2^(k-1) = 1 (mod k) and 7^(k-1) = 1 (mod k)`
	PROGRAM	`Assembly`
	CROSSREFS	`Sequence in context: A104016 A002997 A087788 this_sequence A048123 A131672 A083732` `Adjacent sequences: A083730 A083731 A083732 this_sequence A083734 A083735 A083736`
	KEYWORD	`easy,nonn`
	AUTHOR	`Serhat Sevki Dincer (sevki(AT)ug.bilkent.edu.tr), May 05 2003`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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