id:A068207 - OEIS Search Results

Search: id:A068207

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Numbers n such that the number of divisors of n^2-1 equals the number of divisors of n.

+0
1

2, 6, 40, 54, 66, 70, 78, 80, 88, 110, 114, 128, 130, 182, 216, 222, 238, 250, 258, 276, 310, 318, 354, 366, 384, 402, 410, 418, 438, 456, 488, 498, 552, 594, 598, 616, 624, 632, 654, 678, 680, 682, 696, 726, 760, 762, 774, 786, 808, 830, 870, 906, 924, 928 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`n such that A000005(n^2-1)=A000005(n)`
	CROSSREFS	`Sequence in context: A054970 A120492 A028300 this_sequence A027161 A081096 A119692` `Adjacent sequences: A068204 A068205 A068206 this_sequence A068208 A068209 A068210`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 23 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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