login
A075295
Interprimes which are of the form s*prime, s=20.
0
60, 260, 1220, 1660, 1780, 3620, 4460, 4660, 6260, 6340, 6980, 7580, 11140, 13180, 13460, 14020, 14540, 15380, 16220, 18220, 19060, 20180, 21940, 22180, 23260, 26420, 28780, 29620, 30980, 31660, 33860, 35540, 37220, 38620, 39860, 40580
OFFSET
1,1
COMMENTS
Interprimes of the form s*prime are in A075277-A075296 ( s = 2 - 21 ). Case s=1 is impossible.
EXAMPLE
260 is an interprime and 260/20 = 13 is prime.
MATHEMATICA
s=20; Select[Table[(Prime[n+1]+Prime[n])/2, {n, 2, 14000}], PrimeQ[ #/s]&]
Select[Total[#]/2&/@Partition[Prime[Range[5000]], 2, 1], PrimeQ[#/20]&] (* Harvey P. Dale, Dec 15 2023 *)
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Zak Seidov, Sep 12 2002
STATUS
approved