A075280 - OEIS

%I #6 Mar 30 2012 17:26:03

%S 15,205,515,1465,1795,1895,2105,3265,3505,3665,4105,4415,4535,4555,

%T 4685,5045,6185,7115,7835,8135,8185,9655,9865,10085,10645,11015,11405,

%U 12085,12295,12385,13235,14395,16045,16355,16735,17065

%N Interprimes which are of the form s*prime, s=5.

%C Interprimes which are of the form s*prime are in A075277-A075296 (s = 2-21). Case s = 1 is impossible.

%e 205 is an interprime and 205/5 = 41 is prime.

%t s=5; Select[Table[(Prime[n+1]+Prime[n])/2, {n, 2, 1000}], PrimeQ[ #/s]&]

%Y Cf. A075277-A075296.

%K easy,nonn

%O 1,1

%A _Zak Seidov_, Sep 12 2002