A318645 Decimal expansion of the asymptotic density of e-perfect numbers (A054979).

8, 6, 9, 4, 1, 9, 3, 9, 9

Offset

-2,1

Links

Table of n, a(n) for n=-2..6.

Peter Hagis, Some results concerning exponential divisors, International Journal of Mathematics and Mathematical Sciences, Vol. 11 No. 2 (1988), pp. 343-349.

Eric Weisstein's World of Mathematics, e-Perfect Number

Formula

Equals Sum_{i>=1} beta(e(i))/e(i), where beta(n) = (6/Pi^2)*Product_{p|n}(p/(p+1)) and e(i) = A054980(i).

Example

0.00869419399...

Crossrefs

Cf. A049419, A051377, A054979, A054980.

Sequence in context: A084893 A019939 A343061 * A021096 A021119 A256686

Adjacent sequences: A318642 A318643 A318644 * A318646 A318647 A318648

Keyword

nonn,cons,more

Author

Amiram Eldar, Aug 31 2018

Extensions

Offset corrected by Jianing Song, Feb 06 2019

Status

approved