A172048 a(n) = A104275(n) + A014076(n).

2, 14, 23, 32, 38, 41, 50, 53, 59, 68, 74, 77, 83, 86, 95, 98, 104, 113, 116, 122, 128, 131, 137, 140, 143, 149, 158, 167, 173, 176, 179, 182, 185, 188, 194, 200, 203, 212, 215, 218, 221, 230, 233, 239, 242, 248, 254, 257, 263, 266, 275, 278, 281, 284, 293

Offset: 1

Author

Roger L. Bagula, Jan 24 2010

Keywords

• nonn
• easy
• less

Comments

Alternatively: the sequence of the numbers 3*k-1 for all nonprime 2*k-1, k >= 1.

Links

• G. C. Greubel, Table of n, a(n) for n = 1..5000

Crossrefs

Cf. A104275, A014076.

Programs

Mathematica

Flatten[Table[If[PrimeQ[2*n - 1], {}, 3*n - 1], {n, 1, 100}]]

Extensions

The two equivalent definitions separated by the Assoc. Editors of the OEIS, Feb 02 2010