OFFSET
1,1
FORMULA
EXAMPLE
a(1) = 15*51. a(2) = 26*62. a(3) = 39*93. a(4) is not 51*15 because that has already occurred as a(1). a(4) = 58*85.
CROSSREFS
KEYWORD
easy,base,nonn
AUTHOR
Jonathan Vos Post, Mar 13 2009
EXTENSIONS
4930 inserted by R. J. Mathar, Dec 06 2009
STATUS
approved