OFFSET
0,3
EXAMPLE
a(3) = 19 since 30 is the 3rd primorial number and 30k+m is always composite if m = 0, 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27 or 28.
CROSSREFS
KEYWORD
nonn
AUTHOR
Henry Bottomley, Sep 08 2000
STATUS
approved