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

1,1

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.

Links

Table of n, a(n) for n=1..70.

Formula

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

Crossrefs

Cf. A078703, A091236, A273164.

Sequence in context: A212300 A165074 A374152 * A336313 A095139 A109038

Adjacent sequences: A273162 A273163 A273164 * A273166 A273167 A273168

Keyword

nonn,easy

Author

Wolfdieter Lang, Jul 29 2016

Status

approved