id:A104381 - OEIS Search Results

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Numbers n such that 10^(n-1) == 1 (mod n).

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1, 3, 7, 9, 11, 13, 17, 19, 23, 29, 31, 33, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 91, 97, 99, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 259, 263 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`Superset of the full reptend primes.`
	LINKS	`Eric Weisstein's World of Mathematics, Full Reptend Prime`
	MATHEMATICA	`Select[ Range[270], Mod[ PowerMod[10, # - 1, # ] - 1, # ] == 0 &] (from Robert G. Wilson v Mar 16 2005)`
	CROSSREFS	`Sequence in context: A069254 A105585 A080903 this_sequence A136333 A134454 A113522` `Adjacent sequences: A104378 A104379 A104380 this_sequence A104382 A104383 A104384`
	KEYWORD	`nonn`
	AUTHOR	`Eric Weisstein (eric(AT)weisstein.com), Mar 03, 2005`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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