id:A128957 - OEIS Search Results

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a(n) is equal to the number of positive integers m less than or equal to 10^n such that m is not divisible by at least one of the primes 2,5 and is not divible by at least one of the primes 3,7.

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86, 857, 8571, 85715, 857142, 8571429, 85714286, 857142857, 8571428571, 85714285715, 857142857142, 8571428571429, 85714285714286, 857142857142857, 8571428571428571, 85714285714285715, 857142857142857142 (list; graph; listen)

	OFFSET	`2,1`
	LINKS	`Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets`
	FORMULA	`f(n)= 10^n-floor(10^n/10)-floor(10^n/21)+floor(10^n/210)`
	EXAMPLE	`a(6)=857142`
	MAPLE	`f := n->10^n-floor(10^n/10)-floor(10^n/21)+floor(10^n/210);`
	CROSSREFS	`Cf. A092695.` `Sequence in context: A162028 A157443 A035136 this_sequence A034277 A055534 A017802` `Adjacent sequences: A128954 A128955 A128956 this_sequence A128958 A128959 A128960`
	KEYWORD	`nonn`
	AUTHOR	`Milan R. Janjic (agnus(AT)blic.net), Apr 28 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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