A247892 Number of nonprimes in n-th row of triangle A077581.

1, 1, 2, 1, 3, 1, 4, 3, 4, 3, 7, 3, 8, 5, 8, 6, 11, 4, 12, 7, 11, 9, 15, 6, 15, 12, 16, 12, 20, 4, 21, 15, 19, 16, 22, 10, 26, 18, 23, 17, 29, 11, 30, 22, 24, 24, 33, 16, 34, 22, 31, 25, 38, 19, 36, 27, 35, 30, 43, 15, 44, 33, 36, 34, 44, 22, 49, 36, 43, 27

Offset: 1

Author

Reinhard Zumkeller, Sep 26 2014

Keywords

• nonn

Comments

a(n) = n - A247815(n)

Crossrefs

Cf. A077581, A247815.

Programs

Haskell

a247892 n = n - a247815 n