A137621 - OEIS

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A137621

Divisors of nonprimes not occurring earlier.

1, 2, 4, 3, 6, 8, 9, 5, 10, 12, 7, 14, 15, 16, 18, 20, 21, 11, 22, 24, 25, 13, 26, 27, 28, 30, 32, 33, 17, 34, 35, 36, 19, 38, 39, 40, 42, 44, 45, 23, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 29, 58, 60, 31, 62, 63, 64, 65, 66, 68, 69, 70, 72, 37, 74, 75, 76, 77, 78, 80, 81, 41 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Permutation with inverse A137622; A137623(n) = a(a(n)).` `a(A120632(n))=A000040(n); a(A120632(n)+1)=A100484(n); a(A137624(n))=A018252(n).`
	LINKS	`R. Zumkeller, Table of n, a(n) for n = 1..10001` `Index entries for sequences that are permutations of the natural numbers`
	EXAMPLE	`1;2,4;3,6;8;9;5,10;12;7,14;15;16;18;20;21;11,22;24; .. .`
	CROSSREFS	`Sequence in context: A191670 A065562 A120233 * A039864 A101906 A120241` `Adjacent sequences: A137618 A137619 A137620 * A137622 A137623 A137624`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Jan 30 2008`

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Last modified February 16 04:47 EST 2012. Contains 205860 sequences.