A054793 - OEIS

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A054793

Earliest sequence with a(a(n))=n^4.

0, 1, 3, 16, 5, 256, 7, 1296, 9, 4096, 11, 10000, 13, 20736, 15, 38416, 81, 18, 83521, 20, 130321, 22, 194481, 24, 279841, 26, 390625, 28, 531441, 30, 707281, 32, 923521, 34, 1185921, 36, 1500625, 38, 1874161, 40, 2313441, 42, 2825761, 44, 3418801, 46 (list; graph; refs; listen; history; internal format)

	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 4th power then a(n)=a(n^(1/4))^4, otherwise if the difference between n and the highest 4th power less than n is odd then a(n)=n+1, otherwise a(n)=(n-1)^4.`
	CROSSREFS	`Cf. A000290, A007379.` `Sequence in context: A139815 A165969 A098373 * A063709 A195880 A195883` `Adjacent sequences: A054790 A054791 A054792 * A054794 A054795 A054796`
	KEYWORD	`nice,nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Apr 27 2000`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.