A279400 Row lengths of the irregular triangle A279399.

3, 3, 4, 5, 6, 6, 7, 7, 7, 10, 9, 9, 9, 10, 10, 10, 12, 12, 13, 13, 13, 14, 14, 14, 14, 16, 17, 16, 15, 17, 17, 16, 18, 19, 19, 19, 18, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 23, 23

Offset: 1

Author

Wolfdieter Lang, Jan 25 2017

Keywords

• nonn

Comments

a(n) is the number of primes of the smallest positive restricted residue system modulo A033949(n).

Crossrefs

Cf. A033949, A279399.