A090325 Least (distinct) k such that k, k+n, k+2n are all composite. Rearrangement of composite numbers.

8, 4, 6, 10, 15, 9, 14, 12, 16, 18, 22, 20, 25, 21, 24, 26, 28, 27, 30, 32, 33, 34, 35, 36, 38, 39, 42, 40, 46, 44, 49, 48, 45, 50, 51, 52, 54, 56, 55, 58, 63, 57, 62, 60, 65, 64, 68, 66, 70, 69, 72, 74, 76, 75, 77, 78, 81, 80, 82, 84, 85, 86, 87, 88, 90, 92, 91, 94, 93, 95, 98

Offset

1,1

Links

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

Maple

N:= 100: # to get all terms before the first term > N
Avail:= remove(isprime, [$4..N]):
for n from 1 while Avail <> [] do
  for a in Avail while isprime(a+n) or isprime(a+2*n) do od:
  if a = Avail[-1] and isprime(a+n) or isprime(a+2*n) then break fi;
  A[n]:= a;
  Avail:= subs(a=NULL, Avail);
od:
seq(A[i], i=1..n-1); # Robert Israel, Nov 19 2017

Crossrefs

Sequence in context: A266556 A199434 A253073 * A090469 A322743 A168546

Adjacent sequences: A090322 A090323 A090324 * A090326 A090327 A090328

Keyword

nonn

Author

Amarnath Murthy, Dec 02 2003

Extensions

More terms from David Wasserman, Nov 04 2005

Status

approved