A085131 Multiples of 8 which are 7-smooth.

8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 96, 112, 120, 128, 144, 160, 168, 192, 200, 216, 224, 240, 256, 280, 288, 320, 336, 360, 384, 392, 400, 432, 448, 480, 504, 512, 560, 576, 600, 640, 648, 672, 720, 768, 784, 800, 840, 864, 896, 960, 1000, 1008, 1024

Offset: 1

Author

Amarnath Murthy, Jul 06 2003

Keywords

• easy
• nonn

Comments

Equivalently, multiples of 8 with the largest prime divisor < 10.

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Intersection of A008590 and A002473.

Cf. A085125, A085126, A085127, A085128, A085129, A080194, A085132.

Programs

Mathematica

Select[8*Range[200],FactorInteger[#][[-1,1]]<10&] (* Harvey P. Dale, Oct 22 2017 *)

Formula

From Amiram Eldar, Sep 22 2024: (Start)

a(n) = 8*A002473(n).

Sum_{n>=1} 1/a(n) = 35/64. (End)

Extensions

More terms from David Wasserman, Jan 28 2005

Offset changed by Andrew Howroyd, Sep 22 2024