A049234 Number of divisors of prime(n) + 2.

3, 2, 2, 3, 2, 4, 2, 4, 3, 2, 4, 4, 2, 6, 3, 4, 2, 6, 4, 2, 6, 5, 4, 4, 6, 2, 8, 2, 4, 4, 4, 4, 2, 4, 2, 6, 4, 8, 3, 6, 2, 4, 2, 8, 2, 4, 4, 9, 2, 8, 4, 2, 6, 4, 4, 4, 2, 8, 6, 2, 8, 4, 4, 2, 12, 4, 6, 4, 2, 8, 4, 3, 6, 8, 4, 8, 4, 8, 4, 4, 2, 6, 2, 8, 9, 4, 4, 8, 2, 8, 4, 4, 4, 4, 4, 4, 4, 2, 12, 4, 6, 4, 4

Offset: 1

Author

Labos Elemer

Keywords

• nonn
• easy

Examples

			a(10) = d(prime(10)+2) = d(29+2) = d(29) = 2.
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A000005, A052147.

Programs

Mathematica

Table[DivisorSigma[0,Prime[n]+2],{n,1,103}]

PARI

a(n) = numdiv(prime(n)+2); \\ Michel Marcus, Dec 15 2013

Formula

a(n) = A000005(A052147(n)). - Amiram Eldar, Feb 16 2025