id:A014684 - OEIS Search Results

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In the sequence of positive integers subtract 1 from each prime number.

+0
8

1, 1, 2, 4, 4, 6, 6, 8, 9, 10, 10, 12, 12, 14, 15, 16, 16, 18, 18, 20, 21, 22, 22, 24, 25, 26, 27, 28, 28, 30, 30, 32, 33, 34, 35, 36, 36, 38, 39, 40, 40, 42, 42, 44, 45, 46, 46, 48, 49, 50, 51, 52, 52, 54, 55, 56, 57, 58, 58, 60, 60, 62, 63, 64, 65, 66, 66, 68, 69, 70, 70, 72 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`a(n) = phi(n!)/phi((n-1)!). - Vladeta Jovovic (vladeta(AT)eunet.rs), Nov 30 2002`
	CROSSREFS	`Cf. A000010, A048855.` `A005171(n) + n - 1.` `Sequence in context: A111650 A156686 A085914 this_sequence A113638 A111457 A161765` `Adjacent sequences: A014681 A014682 A014683 this_sequence A014685 A014686 A014687`
	KEYWORD	`nonn,easy`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from Andrew J. Gacek (andrew(AT)dgi.net)`

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

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