

A191622


Decimal expansion of the growth constant for the partial sums of maximal unitary squarefree divisors.


0



6, 4, 9, 6, 0, 6, 6, 9, 9, 3, 3, 7, 3, 4, 1, 1, 9, 4, 7, 3, 3, 9, 0, 4, 8, 8, 0, 4, 8, 0, 2, 1, 2, 1, 2, 6, 7, 0, 3, 8, 1, 0, 8, 9, 9, 3, 1, 9, 8, 8, 2, 8, 8, 3
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OFFSET

0,1


COMMENTS

The partial sums grow sum_{n=1..N} A055231(n) = (this constant)*N^2/2 +O(N^(3/2)).


LINKS

Table of n, a(n) for n=0..53.
Steven R. Finch, Unitarism and Infinitarism, February 25, 2004, Section 0.4. [Cached copy, with permission of the author]


FORMULA

Equals product_{primes p=2,3,5,7,...} (1 (p^2+p1)/(p^3*(p+1)) ).


EXAMPLE

0.64960669933734119473390...


CROSSREFS

Sequence in context: A153630 A113276 A086034 * A021943 A168198 A177898
Adjacent sequences: A191619 A191620 A191621 * A191623 A191624 A191625


KEYWORD

cons,nonn,more


AUTHOR

R. J. Mathar, Jun 09 2011


STATUS

approved



