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A106598 Number of positive integers <= 10^n that are divisible by no prime exceeding 5. 4
1, 9, 34, 86, 175, 313, 507, 768, 1105, 1530, 2053, 2683, 3429, 4301, 5310, 6466, 7780, 9259, 10917, 12761, 14801, 17048, 19511, 22201, 25127, 28300, 31730, 35425, 39397, 43654, 48207, 53066, 58243, 63746, 69584, 75769, 82310, 89216, 96499, 104168 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..39.

MATHEMATICA

n = 40; t = Select[ Flatten[ Table[ 5^c*Select[ Flatten[ Table[2^a*3^b, {a, 0, n*Log[2, 10]}, {b, 0, n*Log[3, 10]}]], # <= 10^n &], {c, 0, n*Log[5, 10]}]], # <= 10^n &]; Table[ Length[ Select[t, # <= 10^n &]], {n, 0, 40}]

CROSSREFS

Sequence in context: A273744 A133547 A100179 * A279128 A293038 A014816

Adjacent sequences:  A106595 A106596 A106597 * A106599 A106600 A106601

KEYWORD

nonn

AUTHOR

Robert G. Wilson v, May 27 2005

STATUS

approved

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Last modified January 22 05:11 EST 2019. Contains 319353 sequences. (Running on oeis4.)