id:A137698 - OEIS Search Results

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a(1)=2. a(n) = the smallest integer > a(n-1) that is not in sequence A137699. A137699(n) = the smallest integer > A137698(n) and not coprime to A137698(n). (A137699(n) = A137698(n) + smallest prime dividing A137698(n).).

+0
2

2, 3, 5, 7, 8, 9, 11, 13, 15, 16, 17, 19, 20, 21, 23, 25, 27, 28, 29, 31, 32, 33, 35, 37, 39, 41, 43, 44, 45, 47, 49, 50 (list; graph; listen)

	OFFSET	`1,1`
	EXAMPLE	`Checking for the value of a(17): a(16) = 25. Checking 26, we see that A137699(8) = 26 (because a(8) = 13, and 26 is the smallest integer > 13 that is not coprime to 13). So a(17) does not equal 26. 27, however, does not occur in sequence A137699. So a(17) = 27.`
	CROSSREFS	`Cf. A137699.` `Sequence in context: A047255 A062062 A078643 this_sequence A063743 A144100 A086539` `Adjacent sequences: A137695 A137696 A137697 this_sequence A137699 A137700 A137701`
	KEYWORD	`easy,more,nonn`
	AUTHOR	`Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Feb 06 2008`

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Last modified December 3 01:16 EST 2008. Contains 151161 sequences.

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