OFFSET
1,2
COMMENTS
For the numbers of digits of the associated primes, see A142960.
REFERENCES
J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 76, pp 26, Ellipses, Paris 2008.
FORMULA
CROSSREFS
KEYWORD
nonn
AUTHOR
Lekraj Beedassy, Jul 13 2008
STATUS
approved