A366673 a(n) is the least triprime k such that k + n is the next triprime after k.

27, 18, 63, 8, 45, 12, 20, 130, 138, 154, 52, 30, 561, 78, 1194, 1930, 4277, 292, 5343, 26353, 4255, 7847, 34773, 18628, 71718, 72308, 168114, 64699, 43209, 227451, 239643, 17641, 97061, 162124, 924718, 930311, 488001, 7248711, 2986751, 704908, 4108654, 7220012

Offset: 1

Author

Zak Seidov and Robert Israel, Oct 16 2023

Keywords

• nonn

Examples

			a(3) = 63 because 63 = 3^2 * 7 is a triprime and the next triprime is 63 + 3 = 66 = 2 * 3 * 11.
		

Links

• Martin Raab, Table of n, a(n) for n = 1..83

Crossrefs

Cf. A014612, A131109.

Programs

Maple

T:= select(t -> numtheory:-bigomega(t) = 3, [$1..10^7]):
dT:= T[2..-1]-T[1..-2]:
V:= Vector(42):
for i from 1 to nops(dT) do
  if dT[i] <= 42 and V[dT[i]] = 0 then V[dT[i]]:= T[i] fi
od:
convert(V,list);