A073704 Smallest prime p such that also p-prime(n)*2 is a prime.

7, 11, 13, 17, 29, 29, 37, 41, 53, 61, 67, 79, 89, 89, 97, 109, 131, 127, 137, 149, 149, 163, 173, 181, 197, 233, 211, 227, 223, 229, 257, 269, 277, 281, 311, 307, 317, 331, 337, 349, 389, 367, 389, 389, 397, 401, 433, 449, 457, 461, 479, 491, 487, 509, 521, 557, 541, 547, 557, 569, 569, 593, 617

Offset

1,1

Links

Robert Israel, Table of n, a(n) for n = 1..10000

Maple

f:= proc(n) local p, r;
  r:= ithprime(n)*2;
  p:= prevprime(r);
  do
    p:= nextprime(p)
  until isprime(p-r);
  p
end proc:
map(f, [$1..100]); # Robert Israel, Jul 02 2026

Crossrefs

Cf. A073703, A001747, A000040, A020484.

Sequence in context: A191079 A279190 A309671 * A040108 A038931 A141189

Adjacent sequences: A073701 A073702 A073703 * A073705 A073706 A073707

Keyword

nonn,changed

Author

Reinhard Zumkeller, Aug 04 2002

Status

approved