A075284 Interprimes which are of the form s*prime, s=9.

18, 45, 99, 279, 747, 909, 1611, 1737, 2007, 2259, 2439, 2799, 3879, 5193, 5571, 5787, 6147, 6219, 6471, 6813, 6849, 7677, 8271, 8577, 8703, 8739, 8793, 9279, 9549, 9621, 10107, 10161, 10629, 10953, 11241, 11511, 11619, 11709, 13329, 14031

Offset

1,1

Comments

Interprimes which are 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

279 is an interprime and 279/9 = 31 is prime.

Mathematica

s=9; Select[Table[(Prime[n+1]+Prime[n])/2, {n, 2, 1000}], PrimeQ[ #/s]&]
Select[Mean/@Partition[Prime[Range[2000]], 2, 1], PrimeQ[#/9]&] (* Harvey P. Dale, Apr 27 2024 *)

Crossrefs

Cf. A075277-A075296.

Sequence in context: A002798 A124388 A179896 * A057444 A130414 A108642

Adjacent sequences: A075281 A075282 A075283 * A075285 A075286 A075287

Keyword

easy,nonn,changed

Author

Zak Seidov, Sep 12 2002

Status

approved