id:A068406 - OEIS Search Results

Search: id:A068406

Displaying 1-1 of 1 results found.

page 1

Numbers n such that n and 2n+1 have the same number of prime divisors.

+0
1

2, 3, 4, 5, 8, 9, 10, 11, 13, 22, 23, 28, 29, 34, 38, 41, 45, 46, 53, 55, 57, 58, 72, 76, 77, 80, 81, 83, 85, 87, 88, 89, 91, 92, 93, 94, 100, 104, 106, 108, 112, 113, 117, 118, 121, 122, 123, 124, 125, 128, 129, 131, 133, 143, 145, 147, 148, 152, 159, 160, 161, 162 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`n such that omega(n)=omega(2n+1)`
	CROSSREFS	`Sequence in context: A004827 A155941 A046892 this_sequence A047247 A140769 A032877` `Adjacent sequences: A068403 A068404 A068405 this_sequence A068407 A068408 A068409`
	KEYWORD	`easy,nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 09 2002`

page 1

Search completed in 0.002 seconds

Last modified December 5 08:23 EST 2009. Contains 170348 sequences.

AT&T Labs Research