id:A075077 - OEIS Search Results

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a(1) =1 and then the smallest number not occurring earlier such that a(n)+a(n+1) gives a different composite number (not obtained earlier).

+0
2

1, 3, 5, 4, 2, 8, 6, 9, 7, 11, 10, 12, 13, 14, 16, 17, 15, 19, 20, 18, 22, 23, 21, 25, 24, 26, 28, 27, 29, 31, 32, 30, 34, 35, 33, 37, 38, 36, 40, 41, 39, 43, 42, 44, 46, 45, 47, 48, 50, 49, 51, 53, 52, 54, 56, 55, 57, 58, 59, 60, 61, 62, 63, 65, 64, 66, 67, 68, 70, 71, 69, 73 (list; graph; listen)

	OFFSET	`1,2`
	EXAMPLE	`19 (not 18) follows 15 though 15+18 = 33 is also composite but 33 is already obtained as 16 +17.`
	CROSSREFS	`Cf. A075078.` `Sequence in context: A165109 A134892 A055266 this_sequence A081361 A086181 A000655` `Adjacent sequences: A075074 A075075 A075076 this_sequence A075078 A075079 A075080`
	KEYWORD	`nonn`
	AUTHOR	`Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 09 2002`
	EXTENSIONS	`More terms from Sascha Kurz (sascha.kurz(AT)uni-bayreuth.de), Feb 01 2003`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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