A083734 - OEIS

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A083734

Pseudoprimes to bases 3 and 5.

1541, 1729, 1891, 2821, 6601, 8911, 15841, 29341, 41041, 46657, 52633, 63973, 75361, 88831, 101101, 112141, 115921, 126217, 146611, 162401, 172081, 188461, 218791, 252601, 294409, 314821, 334153, 340561, 342271, 399001, 410041, 416641 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	LINKS	`R. J. Mathar, Table of n, a(n) for n=1..147` `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 5^(k-1) = 1 (mod k)` `Intersection of A005935 and A005936.`
	EXAMPLE	`a(1)=1541 since it is the first number such that 3^(k-1) = 1 (mod k) and 5^(k-1) = 1 (mod k)`
	CROSSREFS	`Sequence in context: A200429 A092717 A203134 * A137598 A133560 A038009` `Adjacent sequences: A083731 A083732 A083733 * A083735 A083736 A083737`
	KEYWORD	`easy,nonn`
	AUTHOR	`Serhat Sevki Dincer (sevki(AT)ug.bilkent.edu.tr), May 05 2003`

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.