A083732 - OEIS

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A083732

Pseudoprimes to bases 2 and 5.

561, 1729, 2821, 5461, 6601, 8911, 12801, 13981, 15841, 29341, 41041, 46657, 52633, 63973, 68101, 75361, 101101, 113201, 115921, 126217, 137149, 162401, 172081, 188461, 252601, 294409, 314821, 334153, 340561, 399001, 401401, 410041, 488881 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`R. J. Mathar, Table of n, a(n) for n=1..169` `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 5^(k-1) = 1 (mod k)` `Intersection of A001567 and A005936. - R. J. Mathar, Apr 05 2011`
	EXAMPLE	`a(1)=561 since 561 is the first positive integer k(>1) which satisfies 2^(k-1) = 1 (mod k) and 5^(k-1) = 1 (mod k)`
	CROSSREFS	`Sequence in context: A175737 A048123 A131672 * A135720 A097130 A110889` `Adjacent sequences: A083729 A083730 A083731 * A083733 A083734 A083735`
	KEYWORD	`easy,nonn`
	AUTHOR	`Serhat Sevki Dincer (sevki(AT)ug.bilkent.edu.tr), May 05 2003`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.