A107621 Primes multiplied alternately by 2 and 3.

4, 9, 10, 21, 22, 39, 34, 57, 46, 87, 62, 111, 82, 129, 94, 159, 118, 183, 134, 213, 146, 237, 166, 267, 194, 303, 206, 321, 218, 339, 254, 393, 274, 417, 298, 453, 314, 489, 334, 519, 358, 543, 382, 579, 394, 597, 422, 669, 454, 687

Offset: 1

Author

Zak Seidov, May 18 2005

Keywords

• easy
• nonn

Comments

Cf. A107620 Primes multiplied alternately by 3 and 2.

Crossrefs

Cf. A107620.

Programs

Mathematica

A107621[n_]:= Prime[n] (3 - Mod[n, 2])

Formula

A107621(n) = prime(n)*(3 - mod(n, 2)).