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A108277 Number of positive integers <= 10^n that are divisible by no prime exceeding 23. +0
1
1, 10, 76, 369, 1385, 4298, 11654 (list; graph; listen)
OFFSET

0,2

MATHEMATICA

n = 6; t = Select[ Flatten[ Table[23^i*Select[ Flatten[ Table[19^h*Select[ Flatten[ Table[17^g*Select[ Flatten[ Table[13^f*Select[ Flatten[ Table[11^e*Select[ Flatten[ Table[7^d*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 &], {d, 0, n*Log[7, 10]}]], # <= 10^n &], {e, 0, n*Log[11, 10]}]], # <= 10^n &], {f, 0, n*Log[13, 10]}]], # <= 10^n &], {g, 0, n*Log[17, 10]}]], # <= 10^n &], {h, 0, n*Log[19, 10]}]], # <= 10^n &], {i, 0, n*Log[23, 10]}]], # <= 10^n &]; Table[ Length[ Select[t, # <= 10^n &]], {n, 0, 10}]

CROSSREFS

Sequence in context: A025015 A049392 A136869 this_sequence A061319 A016149 A081199

Adjacent sequences: A108274 A108275 A108276 this_sequence A108278 A108279 A108280

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), May 31 2005

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Last modified August 29 17:54 EDT 2008. Contains 143238 sequences.


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