id:A159253 - OEIS Search Results

Search: id:A159253

Displaying 1-1 of 1 results found.

page 1

a(n) is the smallest positive integer not yet in the sequence such that n * a(n) is a cube.

+0
2

1, 4, 9, 2, 25, 36, 49, 8, 3, 100, 121, 18, 169, 196, 225, 32, 289, 12, 361, 50, 441, 484, 529, 72, 5, 676, 27, 98, 841, 900, 961, 16, 1089, 1156, 1225, 6, 1369, 1444, 1521, 200, 1681, 1764, 1849, 242, 75, 2116, 2209, 288, 7, 20, 2601, 338, 2809, 108, 3025, 392 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`This is a self-inverse permutation of the positive integers.`
	FORMULA	`Multiplicative with a(p^{3n}) = p^{3n}, a(p^{3n+1}) = p^{3n+2), and a(p^{3n+2)) = p^{3n+1).`
	CROSSREFS	`Cf. A064429 (function on exponents)` `Sequence in context: A048798 A007914 A048758 this_sequence A011262 A073843 A073842` `Adjacent sequences: A159250 A159251 A159252 this_sequence A159254 A159255 A159256`
	KEYWORD	`mult,nonn`
	AUTHOR	`Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Apr 07 2009`

page 1

Search completed in 0.002 seconds

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

AT&T Labs Research