id:A098426 - OEIS Search Results

Search: id:A098426

Displaying 1-1 of 1 results found.

page 1

a(n)=(1/2)*sum(i=0,n,rad(binomial(n,i))) where rad(k)=A007947(k).

+0
1

1, 2, 4, 6, 16, 27, 64, 66, 94, 287, 1024, 645, 2380, 6723, 12094, 7136, 36772, 38733, 161254, 241083, 571714, 1203173, 4194304, 2005009, 2162496, 8739877, 6699838, 27330423, 112844656, 41322885, 252807388, 201501336, 419398108, 2840231975 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`For n>1 a(n) odd seems to imply 2*phi(n)<n where phi= totient function.`
	CROSSREFS	`Sequence in context: A078148 A076075 A030157 this_sequence A045665 A133492 A045663` `Adjacent sequences: A098423 A098424 A098425 this_sequence A098427 A098428 A098429`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Oct 26 2004`

page 1

Search completed in 0.002 seconds

Last modified July 26 13:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research