id:A054791 - OEIS Search Results

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Earliest sequence with a(a(n))=n^2.

+0
2

0, 1, 3, 4, 9, 6, 25, 8, 49, 16, 11, 100, 13, 144, 15, 196, 81, 18, 289, 20, 361, 22, 441, 24, 529, 36, 27, 676, 29, 784, 31, 900, 33, 1024, 35, 1156, 625, 38, 1369, 40, 1521, 42, 1681, 44, 1849, 46, 2025, 48, 2209, 64, 51, 2500, 53, 2704, 55, 2916, 57, 3136, 59 (list; graph; listen)

	OFFSET	`0,3`
	LINKS	`T. D. Noe, Table of n, a(n) for n=0..1000` `Index entries for sequences of the a(a(n)) = 2n family`
	FORMULA	`if n is a square then a(n)=a(sqrt(n))^2, otherwise if the difference between n and the highest square less than n is odd then a(n)=n+1, otherwise a(n)=(n-1)^2`
	CROSSREFS	`Cf. A002516.` `Sequence in context: A132065 A157020 A055225 this_sequence A167531 A062319 A022463` `Adjacent sequences: A054788 A054789 A054790 this_sequence A054792 A054793 A054794`
	KEYWORD	`nice,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Apr 27 2000`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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