id:A080062 - OEIS Search Results

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Composite numbers n such that for all primes p dividing n, p-1 divides n-1.

+0
2

4, 8, 9, 16, 25, 27, 32, 45, 49, 64, 81, 121, 125, 128, 169, 225, 243, 256, 289, 325, 343, 361, 405, 512, 529, 561, 625, 637, 729, 841, 891, 961, 1024, 1105, 1125, 1225, 1331, 1369, 1377, 1681, 1729, 1849, 2025, 2048, 2187, 2197, 2209, 2401, 2465, 2809, 2821 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	`Select[ Range[2, 10^4], !PrimeQ[ # ] && Union[ Mod[ # - 1, Transpose[ FactorInteger[ # ]][[1]] - 1]] == {0} &]`
	CROSSREFS	`Cf. A056729 & A079543.` `Sequence in context: A052054 A046447 A087244 this_sequence A088949 A134600 A134601` `Adjacent sequences: A080059 A080060 A080061 this_sequence A080063 A080064 A080065`
	KEYWORD	`nonn`
	AUTHOR	`Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 23 2003`

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Last modified December 6 13:45 EST 2009. Contains 170429 sequences.

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