id:A121912 - OEIS Search Results

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A121912

Numbers n such that 10^n == 10 modulo n.

+0
3

1, 2, 3, 5, 6, 7, 9, 10, 11, 13, 15, 17, 18, 19, 23, 29, 30, 31, 33, 37, 41, 43, 45, 47, 53, 55, 59, 61, 67, 71, 73, 79, 83, 89, 90, 91, 97, 99, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 165, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`By Fermat, all primes are members.`
	EXAMPLE	`13 is here because 10^13 = 13*769230769230 + 10.`
	MATHEMATICA	`Select[Range[250], PowerMod[10, #, # ] == Mod[10, # ] &] (Chandler)`
	CROSSREFS	`Cf. A056969 = 10^n modulo n, A121014.` `Sequence in context: A099308 A074235 A001948 this_sequence A120514 A101886 A135674` `Adjacent sequences: A121909 A121910 A121911 this_sequence A121913 A121914 A121915`
	KEYWORD	`nonn`
	AUTHOR	`Zak Seidov (zakseidov(AT)yahoo.com), Sep 02 2006`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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