|
|
A066367
|
|
The floor(p(n)/n)-perfect numbers, where p(n) denotes the n-th prime and f-perfect numbers for an arithmetical function f are defined in A066218.
|
|
0
|
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
f[x_] := Floor[Prime[x] / x]; Select[ Range[2, 10^5], 2 * f[ # ] == Apply[ Plus, Map[ f, Divisors[ # ] ] ] & ] There do not seem to be any more terms. There are no terms between 170 and 10^5.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|