id:A023899 - OEIS Search Results

Search: id:A023899

Displaying 1-1 of 1 results found.

page 1

Integer values of Divisor balance.

+0
2

1, 3, 5, 7, 4, 9, 12, 11, 20, 9, 13, 28, 7, 27, 10, 26, 15, 36, 21, 45, 14, 25, 17, 44, 25, 35, 63, 8, 42, 42, 16, 19, 7, 52, 6, 49, 81, 24, 10, 30, 40, 70, 78, 21, 21, 19, 60, 18, 63, 99, 40, 30, 98, 7, 18, 75, 15, 23, 57, 35, 30, 57, 68, 75, 36, 35, 30, 77, 55, 74, 91, 117 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`$\rm{Dbal}(n) = sum_{d divides n} {d \over \phi(d)} $.`
	MATHEMATICA	`Select[ Array[ Function[ n, Plus @@ Map[ #/EulerPhi[ # ]&, Divisors[ n ] ] ], 3000 ], IntegerQ ]`
	CROSSREFS	`A023898.` `Sequence in context: A101088 A134487 A064537 this_sequence A085965 A070647 A070949` `Adjacent sequences: A023896 A023897 A023898 this_sequence A023900 A023901 A023902`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (ogerard(AT)ext.jussieu.fr)`

page 1

Search completed in 0.002 seconds

Last modified July 4 18:25 EDT 2008. Contains 140886 sequences.

AT&T Labs Research