id:A061767 - OEIS Search Results

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a(1) = 4; a(n) = smallest composite number of the form k*n + 1.

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4, 9, 4, 9, 6, 25, 8, 9, 10, 21, 12, 25, 14, 15, 16, 33, 18, 55, 20, 21, 22, 45, 24, 25, 26, 27, 28, 57, 30, 91, 32, 33, 34, 35, 36, 145, 38, 39, 40, 81, 42, 85, 44, 45, 46, 93, 48, 49, 50, 51, 52, 105, 54, 55, 56, 57, 58, 117, 60, 121, 62, 63, 64, 65, 66, 133, 68, 69, 70 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`a(36) = 145 = 4*36 + 1, since 37, 73 and 109 are primes.`
	CROSSREFS	`Sequence in context: A010714 A089090 A113484 this_sequence A131016 A061369 A088377` `Adjacent sequences: A061764 A061765 A061766 this_sequence A061768 A061769 A061770`
	KEYWORD	`nonn,easy`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), May 22 2001`
	EXTENSIONS	`Corrected and extended by Larry Reeves (larryr(AT)acm.org), May 29 2001`

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Last modified December 10 12:37 EST 2009. Contains 170569 sequences.

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