A137780 - OEIS

This site is supported by donations to The OEIS Foundation.

A137780

a(n) = 1 + 2^( prime(n + 1) - prime(n) ).

3, 5, 5, 17, 5, 17, 5, 17, 65, 5, 65, 17, 5, 17, 65, 65, 5, 65, 17, 5, 65, 17, 65, 257, 17, 5, 17, 5, 17, 16385, 17, 65, 5, 1025, 5, 65, 65, 17, 65, 65, 5, 1025, 5, 17, 5, 4097, 4097, 17, 5, 17, 65, 5, 1025, 65, 65, 65, 5, 65, 17, 5, 1025, 16385, 17, 5, 17, 16385, 65, 1025, 5 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,1`
	FORMULA	`a(n) = 1+2^A001223(n) ; A001223(n) = A001511([a(n)/2]) = A007814(a(n)-1)) ; a(n) = 1+4^A028334(n) for n>1. [From M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 21 2009]`
	PROG	`(PARI) a(n) = 1 + 2^( prime(n + 1) - prime(n) )`
	CROSSREFS	`Sequence in context: A028265 A084041 A028254 * A079372 A055382 A165235` `Adjacent sequences: A137777 A137778 A137779 * A137781 A137782 A137783`
	KEYWORD	`nonn`
	AUTHOR	`Alexander R. Povolotsky (pevnev(AT)juno.com), Apr 28 2008`
	EXTENSIONS	`Extended beyond a(30) by M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 21 2009`

Content is available under The OEIS End-User License Agreement .

Last modified February 15 16:39 EST 2012. Contains 205823 sequences.