id:A128950 - 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 the prime 7 and is not divisible by at least one of the primes 2, 3 and 5.

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83, 829, 8286, 82858, 828571, 8285715, 82857143, 828571429, 8285714286, 82857142858, 828571428571, 8285714285715, 82857142857143, 828571428571429, 8285714285714286, 82857142857142858, 828571428571428571 (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/7)-floor(10^n/30)+floor(10^n/210)`
	EXAMPLE	`a(6)=828571`
	MAPLE	`f := n->10^n-floor(10^n/7)-floor(10^n/30)+floor(10^n/210);`
	CROSSREFS	`Sequence in context: A059935 A069596 A112766 this_sequence A068851 A037069 A103233` `Adjacent sequences: A128947 A128948 A128949 this_sequence A128951 A128952 A128953`
	KEYWORD	`nonn`
	AUTHOR	`Milan R. Janjic (agnus(AT)blic.net), Apr 28 2007`

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

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