1,1

Table of n, a(n) for n=1..17.

a=s1/s0, b=x/a, c=s1/x where s1 is the sum and s0 is the number of divisors of x. Here a is not but b and c are integers.

x=21785540, d[ x ]=s0=216 and Sigma[ 1,x ]=8714160. The three quotients are a=40343.334 is not an integer but b=54 and c=4 are integers.

In A007691 and A001599 but not in A003601. Cf. A046985, A046987.

Sequence in context: A079598 A212302 A046999 * A323747 A028145 A028167

Adjacent sequences: A046983 A046984 A046985 * A046987 A046988 A046989

nonn

Labos Elemer

a(12)-a(17) from Donovan Johnson, Nov 30 2008

approved