A213635 m*[n/m], where m is the least nondivisor of n (as in A007978) and [ ] = floor.

0, 0, 2, 3, 4, 4, 6, 6, 8, 9, 10, 10, 12, 12, 14, 15, 16, 16, 18, 18, 20, 21, 22, 20, 24, 24, 26, 27, 28, 28, 30, 30, 32, 33, 34, 35, 36, 36, 38, 39, 40, 40, 42, 42, 44, 45, 46, 45, 48, 48, 50, 51, 52, 52, 54, 54, 56, 57, 58, 56, 60, 60, 62, 63, 64, 64, 66, 66, 68

Offset: 1

Author

Clark Kimberling, Jun 16 2012

Keywords

• nonn
• easy

Crossrefs

Cf. A213633.

Programs

Mathematica

(See A213633.)

Python

def A213635(n): return n-next(filter(None, (n%d for d in range(2,n)))) if n>2 else 0 # Chai Wah Wu, Feb 22 2023