OFFSET
1,1
EXAMPLE
a(1) = 19 = 3+5+11;
a(2) = 53 = 5+7+11+13+17 = 3+7+11+13+19;
a(3) = 97 = 3+5+7+11+13+17+41 = 3+5+7+11+17+23+31 = 3+5+7+11+19+23+29.
CROSSREFS
KEYWORD
nonn
AUTHOR
Giovanni Teofilatto, Dec 08 2004
EXTENSIONS
Edited, corrected and extended by Ray Chandler, Apr 30 2007
STATUS
approved