id:A080666 - OEIS Search Results

Search: id:A080666

Displaying 1-1 of 1 results found.

page 1

Numbers n such that n^2 + 1 and n^2 - 1 are squareful.

+0
1

7, 41, 43, 57, 82, 93, 99, 107, 117, 118, 143, 157, 168, 193, 207, 239, 243, 251, 257, 293, 307, 327, 332, 343, 357, 368, 393, 407, 437, 443, 457, 493, 507, 515, 532, 540, 543, 557, 568, 577, 593, 606, 607, 643, 657, 693, 707, 743, 746, 757, 775, 776, 782 (list; graph; listen)

	OFFSET	`1,1`
	MATHEMATICA	<< NumberTheory`NumberTheoryFunctions` Select[Range[10^3], ! SquareFreeQ[ #^2 - 1] && ! SquareFreeQ[ #^2 + 1] &]
	CROSSREFS	`Cf. A013929.` `Sequence in context: A123747 A023251 A073501 this_sequence A105902 A031909 A007398` `Adjacent sequences: A080663 A080664 A080665 this_sequence A080667 A080668 A080669`
	KEYWORD	`nonn`
	AUTHOR	`Joseph L. Pe (joseph_l_pe(AT)hotmail.com), Mar 02 2003`

page 1

Search completed in 0.002 seconds

Last modified September 7 23:08 EDT 2008. Contains 143486 sequences.

AT&T Labs Research