A081257 - OEIS

This site is supported by donations to The OEIS Foundation.

A081257

Greatest prime factor of n^3-1.

7, 13, 7, 31, 43, 19, 73, 13, 37, 19, 157, 61, 211, 241, 13, 307, 17, 127, 421, 463, 13, 79, 601, 31, 37, 757, 271, 67, 29, 331, 151, 1123, 397, 97, 43, 67, 1483, 223, 547, 1723, 139, 631, 283, 109, 103, 61, 181, 43, 2551, 379, 919, 409, 2971, 79, 103, 3307, 163 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,1`
	EXAMPLE	`a(7)=19 because 7^3-1=342=233*19`
	CROSSREFS	`Cf. A081256, A081258.` `Cf. A096175 n^3-1 is an odd semiprime, A096176 (n^3-1)/(n-1) is prime.` `Sequence in context: A103705 A157517 A164929 * A046163 A130770 A158622` `Adjacent sequences: A081254 A081255 A081256 * A081258 A081259 A081260`
	KEYWORD	`easy,nonn`
	AUTHOR	`Jan Fricke (fricke(AT)uni-greifswald.de), Mar 14 2003`
	EXTENSIONS	`More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), Jun 21 2004`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 23:53 EST 2012. Contains 205860 sequences.