id:A090083 - OEIS Search Results

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Even pseudoprimes to base 9.

+0
13

4, 8, 28, 52, 286, 364, 532, 616, 946, 1036, 1288, 2806, 2926, 3052, 4376, 4636, 5356, 6364, 8744, 8866, 11476, 12124, 15964, 17446, 19096, 19684, 21196, 21736, 24046, 24388, 26596, 31876 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Do[s=Mod[ -1+9^(n-1), n]; If[Equal[s, 0]&&!PrimeQ[n]&&EvenQ[n], Print[n]], {n, 1, 1000000}]`
	CROSSREFS	`Cf. A020138.` `Sequence in context: A104042 A117864 A020138 this_sequence A034515 A059480 A105723` `Adjacent sequences: A090080 A090081 A090082 this_sequence A090084 A090085 A090086`
	KEYWORD	`nonn`
	AUTHOR	`Labos E. (labos(AT)ana.sote.hu), Nov 25 2003`

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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.

AT&T Labs Research