OFFSET
1,2
EXAMPLE
1, 25, 537, 371113, 711131723 are composite numbers. Note that 711131719 is a prime hence a(9) = 23 and not 19.
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Amarnath Murthy, Apr 27 2003
EXTENSIONS
Extended by Ray Chandler, Jan 04 2009
STATUS
approved