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A064453
Number of finite positive integer sequences b(1),...,b(k), with k <= n and b(1)*b(2)*...*b(k) <= n.
1
1, 5, 15, 44, 85, 216, 343, 806, 1299, 2155, 2926, 7162, 9477, 13209, 17935, 37824, 47957, 75600, 93613, 138074, 170730, 209000, 249481, 635974, 764425, 915551, 1109772, 1390375, 1624029, 2103690, 2430431, 5120488, 5976553, 6946897
OFFSET
1,2
COMMENTS
The subsequence of primes begins 5, then no more through a(34). What is the next prime? - Jonathan Vos Post, Jan 07 2011
LINKS
EXAMPLE
Sequences b for n = 2 are {1}, {2}, {1, 1}, {2, 1}, {1, 2}, so a(2)=5.
CROSSREFS
Sequence in context: A178965 A005665 A025471 * A059251 A295179 A274020
KEYWORD
nice,nonn
AUTHOR
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Oct 02 2001
EXTENSIONS
a(21)-a(34) from Donovan Johnson, Sep 06 2010
STATUS
approved