OFFSET
1,1
COMMENTS
EXAMPLE
414 is an interprime and 414/18 = 23 is prime.
MATHEMATICA
s=18; Select[Table[(Prime[n+1]+Prime[n])/2, {n, 2, 4000}], PrimeQ[ #/s]&]
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Sep 12 2002
STATUS
approved