A099521 a(n) is such that A099520(a(n))=n.

1, 2, 5, 3, 4, 9, 6, 11, 54, 8, 7, 10, 19, 12, 72, 21, 14, 23, 84, 16, 25, 13, 18, 29, 15, 22, 33, 17, 26, 37, 156, 28, 39, 30, 41, 190, 32, 45, 34, 47, 218, 36, 51, 20, 40, 57, 42, 59, 27, 44, 24, 46, 284, 48, 286, 31, 50, 292, 52, 77, 300, 79, 35, 81, 85, 56, 87, 58, 89, 60

Offset: 1

Author

Mark Hudson (mrmarkhudson(AT)hotmail.com), Oct 20 2004

Keywords

• easy
• nonn

Examples

			Gives the positions in the sequence A099520 at which the integers n>0 appear. A099520 begins: 1,2,4,5,3,7,11,10,6,12,8,..., so the positions of the integers are: 1,2,5,3,4,9,6,...
		

Crossrefs

Cf. A099520. Also A099506 and A099507 for sequences based on a slightly different definition.