OFFSET
1,1
EXAMPLE
a(1) = 19 = 3+5+11;
a(2) = 43 = 3+5+7+11+17;
a(3) = 79 = 3+5+7+11+13+17+23;
a(4) = 127 = 3+5+7+11+13+17+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