id:A064505 - OEIS Search Results

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Interchange primes and prime-squares.

+0
5

1, 4, 9, 2, 25, 6, 49, 8, 3, 10, 121, 12, 169, 14, 15, 16, 289, 18, 361, 20, 21, 22, 529, 24, 5, 26, 27, 28, 841, 30, 961, 32, 33, 34, 35, 36, 1369, 38, 39, 40, 1681, 42, 1849, 44, 45, 46, 2209, 48, 7, 50, 51, 52, 2809, 54, 55, 56, 57, 58, 3481, 60, 3721, 62, 63, 64, 65, 66 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`a(a(n)) = n, self-inverse permutation for the natural numbers.`
	LINKS	`Zak Seidov, Table of n, a(n) for n = 1..1000.` `Index entries for sequences that are permutations of the natural numbers`
	MATHEMATICA	`s=Range[1000]; Do[p=Prime[n]; s[[p]]=p^2, {n, PrimePi[1000]}]; Do[p=Prime[n]; s[[p^2]]=p, {n, PrimePi[Sqrt@1000]}]; s (* Zak Seidov*)`
	CROSSREFS	`Sequence in context: A079049 A114578 A135044 this_sequence A048798 A007914 A048758` `Adjacent sequences: A064502 A064503 A064504 this_sequence A064506 A064507 A064508`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Oct 16 2001`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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