A162731 a(n) is the n-th triprime (A014612) minus its central prime factor.

6, 10, 15, 18, 24, 26, 27, 39, 42, 42, 45, 50, 60, 63, 66, 65, 70, 74, 75, 90, 91, 96, 99, 100, 105, 111, 114, 114, 122, 120, 125, 135, 140, 146, 150, 147, 162, 160, 165, 168, 170, 171, 170, 175, 183, 186, 185, 190, 204, 210, 219, 225, 224, 234, 231, 231, 242, 238, 243, 250

Offset

1,1

Links

Table of n, a(n) for n=1..60.

Formula

a(n) = A014612(n) - A162361(n).

Example

a(1) =  6 = 2*2*2 - 2;
a(2) = 10 = 2*2*3 - 2;
a(3) = 15 = 2*3*3 - 3;
a(4) = 18 = 2*2*5 - 2;
a(5) = 24 = 3*3*3 - 3.

Crossrefs

Cf. A014612, A162361.

Sequence in context: A315241 A166160 A315242 * A315243 A315244 A315245

Adjacent sequences: A162728 A162729 A162730 * A162732 A162733 A162734

Keyword

nonn,less

Author

Juri-Stepan Gerasimov, Jul 12 2009

Extensions

Definition reformulated, a(11), a(38) etc. corrected by R. J. Mathar, Jul 16 2009

Status

approved