A247815 Number of primes in n-th row of triangle A077581.

0, 1, 1, 3, 2, 5, 3, 5, 5, 7, 4, 9, 5, 9, 7, 10, 6, 14, 7, 13, 10, 13, 8, 18, 10, 14, 11, 16, 9, 26, 10, 17, 14, 18, 13, 26, 11, 20, 16, 23, 12, 31, 13, 22, 21, 22, 14, 32, 15, 28, 20, 27, 15, 35, 19, 29, 22, 28, 16, 45, 17, 29, 27, 30, 21, 44, 18, 32, 26

Offset: 1

Author

Reinhard Zumkeller, Sep 26 2014

Keywords

• nonn

Comments

a(n) = n - A247892(n).

Links

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

Crossrefs

Cf. A000720, A001221, A010051, A069213, A077581, A247892.

Programs

Haskell

a247815 = sum . map a010051' . a077581_row

Formula

a(n) = A000720(A069213(n)) - A001221(n).