OFFSET
0,6
COMMENTS
EXAMPLE
a(26)=4 because 3+5+7+11 = 26. Note that some terms may be expressed in multiple ways. For example, a(47)=6: 2+3+5+7+11+19 and 2+3+5+7+13+17 = 47.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Bob Selcoe, Aug 10 2015
STATUS
approved