id:A156321 - OEIS Search Results

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a(1)=0, a(n+1) is smallest nonprime > 2*a(n).

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0, 1, 4, 9, 20, 42, 85, 171, 343, 687, 1375, 2751, 5504, 11009, 22019, 44039, 88080, 176162, 352325, 704651, 1409303, 2818607, 5637215, 11274431, 22548863, 45097727, 90195455, 180390911, 360781823, 721563647, 1443127295, 2886254591 (list; graph; listen)

	OFFSET	`1,3`
	EXAMPLE	`a(5) is the smallest nonprime > 2a(4)=29=18, hence a(5)=20.`
	CROSSREFS	`Cf. A000027, A055496, A141468.` `Sequence in context: A072934 A084639 A051136 this_sequence A133095 A132175 A019493` `Adjacent sequences: A156318 A156319 A156320 this_sequence A156322 A156323 A156324`
	KEYWORD	`nonn`
	AUTHOR	`Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Feb 08 2009`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 10 2009`

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Last modified November 25 14:49 EST 2009. Contains 167514 sequences.

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