A075290 Interprimes which are of the form s*prime, s=15.

30, 45, 105, 165, 195, 465, 615, 645, 705, 885, 915, 1095, 1695, 2085, 2685, 2955, 2985, 3165, 3345, 3495, 3615, 3945, 4065, 4155, 4755, 5055, 5235, 5505, 6645, 6735, 8445, 8655, 8805, 8985, 9465, 9885, 9915, 10155, 10245, 10635, 10785, 11085

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..42.

Example

105 is an interprime and 105/15 = 7 is prime.

Mathematica

s=15; Select[Table[(Prime[n+1]+Prime[n])/2, {n, 2, 4000}], PrimeQ[ #/s]&]

Crossrefs

Cf. A075277-A075296.

Sequence in context: A164803 A152569 A114944 * A281919 A004222 A207143

Adjacent sequences: A075287 A075288 A075289 * A075291 A075292 A075293

Keyword

easy,nonn

Author

Zak Seidov, Sep 12 2002

Status

approved