id:A054048 - OEIS Search Results

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Earliest sequence with a(a(n))=n*(n+1)/2 (Triangular numbers).

+0
2

0, 1, 4, 10, 3, 7, 55, 15, 9, 36, 6, 12, 66, 14, 91, 28, 17, 136, 19, 171, 22, 1540, 210, 24, 276, 26, 325, 29, 120, 378, 31, 465, 33, 528, 35, 595, 45, 38, 703, 40, 780, 42, 861, 44, 946, 666, 47, 1081, 49, 1176, 51, 1275, 53, 1378, 56, 21, 1485, 58, 1653 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`Index entries for sequences of the a(a(n)) = 2n family`
	EXAMPLE	`a(a(3))=a(10)=6=3*4/2`
	CROSSREFS	`Cf. A000217.` `Sequence in context: A087212 A048870 A070261 this_sequence A121512 A010715 A059132` `Adjacent sequences: A054045 A054046 A054047 this_sequence A054049 A054050 A054051`
	KEYWORD	`base,nice,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Apr 28 2000`

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.

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