OFFSET
1,1
COMMENTS
First four pairs were found by F. Russo and the fifth by Philip Gibbs. It is not known whether other pairs exist.
REFERENCES
A. Murphy, "Smarandache friendly numbers and a few more sequences", Smarandache Notions Journal, Vol. 12, 1-2-3, Spring 2001.
LINKS
EXAMPLE
(2, 5) is a pair because 2 and 5 are primes and 2*5 = 2 + 3 + 5. Similarly (3, 13) is a pair because 3 and 13 are primes and 3*13 = 3 + 5 + 7 + 11 + 13.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
G. Ornea (gornea2005(AT)gmail.com), Apr 28 2010
EXTENSIONS
Edited by N. J. A. Sloane, Jul 02 2017
STATUS
approved