A085125 - OEIS

A085125

Even numbers which are 7-smooth.

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 24, 28, 30, 32, 36, 40, 42, 48, 50, 54, 56, 60, 64, 70, 72, 80, 84, 90, 96, 98, 100, 108, 112, 120, 126, 128, 140, 144, 150, 160, 162, 168, 180, 192, 196, 200, 210, 216, 224, 240, 250, 252, 256, 270, 280, 288, 294, 300, 320, 324, 336

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OFFSET

1,1

COMMENTS

Equivalently, multiples of 2 with the largest prime divisor < 10.

LINKS

Table of n, a(n) for n=1..61.

FORMULA

From Amiram Eldar, Sep 23 2024: (Start)

a(n) = 2*A002473(n).

Sum_{n>=1} 1/a(n) = 35/16. (End)

MATHEMATICA