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A089284
Number of divisors of floor(Pi*10^n), Pi=3.14...
3
2, 2, 4, 6, 8, 2, 8, 8, 48, 8, 16, 4, 8, 8, 8, 8, 72, 4, 64, 96, 16, 64, 128, 128, 8, 24, 256, 8, 32, 64, 16, 64, 192, 4, 24, 40, 96, 2, 32, 4, 16, 48, 8, 32, 16, 64, 48, 8, 320, 8, 32, 48, 8, 64, 192, 48, 16, 32, 16, 64, 96, 128, 8, 120, 16, 64, 32, 48, 8, 32, 192, 512, 64, 96, 144
OFFSET
0,1
FORMULA
a(n) = A000005(A011545(n)).
EXAMPLE
For n=4: floor(Pi*10^4)=31415 has divisors: 1,5,61,103,305,515,6283,31415; a(4)=8.
MATHEMATICA
Table[ DivisorSigma[ 0, Floor[ Pi*10^n]], {n, 0, 10}] (* Robert G. Wilson v, Oct 30 2003 *)
PROG
(PARI) A089284(n)=numdiv(Pi\.1^n) \\ M. F. Hasler, Nov 01 2012
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Oct 30 2003
EXTENSIONS
More terms from Robert G. Wilson v and Ray Chandler, Oct 30 2003
STATUS
approved