A240471 Integer part of (n * A000005(n) / A000203(n)).

1, 1, 1, 1, 1, 2, 1, 2, 2, 2, 1, 2, 1, 2, 2, 2, 1, 2, 1, 2, 2, 2, 1, 3, 2, 2, 2, 3, 1, 3, 1, 3, 2, 2, 2, 3, 1, 2, 2, 3, 1, 3, 1, 3, 3, 2, 1, 3, 2, 3, 2, 3, 1, 3, 3, 3, 2, 2, 1, 4, 1, 2, 3, 3, 3, 3, 1, 3, 2, 3, 1, 4, 1, 2, 3, 3, 3, 3, 1, 4, 3, 2, 1, 4, 3, 2

Offset: 1

Author

Reinhard Zumkeller, Apr 06 2014

Keywords

• nonn

Links

• Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000005, A000203, A038040, A046022, A106315.

Programs

Haskell

a240471 n = n * a000005 n `div` a000203 n

PARI

a(n) = n*numdiv(n)\sigma(n); \\ Michel Marcus, Dec 02 2020

Formula

a(n) = (A038040(n) - A106315(n)) / A000203(n);

a(A046022(n)) = 1.