id:A138309 - OEIS Search Results

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a(1)=1. a(n) = smallest integer > a(n-1) that is coprime to every (nonzero) exponent in the prime factorization of n.

+0
3

1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 33 (list; graph; listen)

	OFFSET	`1,2`
	LINKS	`Leroy Quet, Home Page (listed in lieu of email address)`
	EXAMPLE	`24 has the prime-factorization of 2^3 * 3^1. The smallest integer > a(23)=26 that is coprime to 3 and 1 is 28. (27 is not coprime to 3.) So a(24)=28.`
	CROSSREFS	`Cf. A138308, A138311.` `Sequence in context: A029598 A039193 A028798 this_sequence A001068 A039145 A038129` `Adjacent sequences: A138306 A138307 A138308 this_sequence A138310 A138311 A138312`
	KEYWORD	`more,nonn`
	AUTHOR	`Leroy Quet Mar 13 2008`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.