A273165 One half the number of divisors of nonprime numbers that are 3 (mod 4).

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

Offset: 1

Author

Wolfdieter Lang, Jul 29 2016

Keywords

• nonn
• easy

Comments

Row length numbers of A273164.

With the Jan 05 2004 Jovovic comment on A078703 a(n) is also the number of divisors +1 as well as -1 (mod 4) of A091236(n). See the example section of A273164.

Crossrefs

Cf. A078703, A091236, A273164.

Formula

a(n) = number of divisors of A091236(n)(nonprime numbers 3 (mod 4)).