id:A131880 - OEIS Search Results

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a(n) = the n-th positive integer which is coprime to (2^n -1). a(n) = the n-th term of row n in triangle A131879.

+0
3

1, 2, 3, 7, 5, 10, 7, 14, 10, 16, 11, 31, 13, 20, 17, 31, 17, 32, 19, 46, 24, 34, 23, 62, 25, 38, 31, 56, 29, 61, 31, 62, 39, 50, 36, 97, 37, 56, 45, 97, 41, 74, 43, 86, 53, 70, 47, 122, 49, 85, 59, 98, 53, 103, 58, 122, 66, 88, 59, 173, 61, 92, 74, 127, 67, 125, 67, 127, 81 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`2^6 -1 = 63. a(6) is the 6th positive integer which is coprime to 63. So a(6) = 10.`
	CROSSREFS	`Cf. A131879, A000225.` `Sequence in context: A128804 A120726 A060203 this_sequence A045790 A085102 A087572` `Adjacent sequences: A131877 A131878 A131879 this_sequence A131881 A131882 A131883`
	KEYWORD	`nonn`
	AUTHOR	`Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Jul 23 2007`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 01 2007`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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