A075285 Interprimes which are of the form s*prime, s=10.

30, 50, 170, 370, 590, 610, 730, 1370, 1390, 1910, 1990, 2290, 3310, 3730, 4010, 4990, 5410, 6070, 6590, 7190, 7870, 8770, 9470, 9970, 10610, 11090, 11810, 11930, 12970, 14470, 15230, 15310, 16270, 16570, 16990, 17330, 18790, 19130, 20110

Offset

1,1

Comments

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

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

370 is an interprime and 370/10 = 37 is prime.

Mathematica

s=10; Select[Table[(Prime[n+1]+Prime[n])/2, {n, 2, 4000}], PrimeQ[ #/s]&]
Select[Mean/@Partition[Prime[Range[2500]], 2, 1], PrimeQ[#/10]&] (* Harvey P. Dale, Jun 24 2017 *)

Crossrefs

Cf. A075277-A075296.

Sequence in context: A307130 A379901 A228097 * A361668 A351540 A039349

Adjacent sequences: A075282 A075283 A075284 * A075286 A075287 A075288

Keyword

easy,nonn

Author

Zak Seidov, Sep 12 2002

Status

approved