id:A125050 - OEIS Search Results

Search: id:A125050

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a(1) = 1. If a(n) is composite, a(n+1) = 2*a(n)+1; otherwise, a(n+1) = 2*a(n).

+0
2

1, 2, 4, 9, 19, 38, 77, 155, 311, 622, 1245, 2491, 4983, 9967, 19934, 39869, 79738, 159477, 318955, 637911, 1275823, 2551646, 5103293, 10206587, 20413175, 40826351, 81652702, 163305405, 326610811, 653221623, 1306443247, 2612886495 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A125049.` `Sequence in context: A000678 A081490 A129784 this_sequence A056186 A054135 A099568` `Adjacent sequences: A125047 A125048 A125049 this_sequence A125051 A125052 A125053`
	KEYWORD	`nonn`
	AUTHOR	`Franklin T. Adams-Watters (FrankTAW(AT)Netscape.net), Nov 17 2006`

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Last modified December 11 12:57 EST 2009. Contains 170656 sequences.

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