id:A075340 - OEIS Search Results

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a(1) = 1; a(2n) is the smallest prime == 1 mod (a(2n-1)) and a(2n+1) is the smallest composite number == 1 (mod a(2n)).

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1, 2, 9, 19, 20, 41, 42, 43, 44, 89, 90, 181, 182, 547, 548, 1097, 1098, 7687, 7688, 15377, 15378, 30757, 30758, 276823, 276824, 553649, 553650, 2768251, 2768252, 8304757, 8304758, 99657097, 99657098, 199314197, 199314198, 3189027169 (list; graph; listen)

	OFFSET	`1,2`
	CROSSREFS	`Cf. A075341.` `Sequence in context: A006226 A109298 A075537 this_sequence A031316 A135207 A026541` `Adjacent sequences: A075337 A075338 A075339 this_sequence A075341 A075342 A075343`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 18 2002`
	EXTENSIONS	`More terms from David Wasserman (dwasserm(AT)earthlink.net), Jan 16 2005`

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Last modified December 13 23:45 EST 2009. Contains 170824 sequences.

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