A105069 Number of distinct prime divisors of 100^n - 3.

1, 2, 2, 2, 2, 2, 2, 4, 4, 4, 2, 2, 3, 3, 3, 4, 2, 4, 3, 5, 5, 4, 4, 5, 4, 4, 2, 4, 5, 4, 3, 4, 3, 5, 5, 3, 5, 5, 4, 4, 5, 5, 2, 3, 6, 4, 4, 8, 4, 4, 6, 3, 4, 6, 6, 5, 6, 5, 5, 3, 3, 7, 8, 5, 5, 3, 3, 5, 4, 1, 6, 4, 5, 6, 3, 5, 6, 6, 4, 5, 7, 3, 3, 7, 3, 6, 4, 5, 6, 8, 2, 7, 3, 4, 8, 6, 6, 7, 5, 4, 8, 6, 6, 5, 4, 4, 6, 4, 3, 5, 7

Offset

1,2

Links

Table of n, a(n) for n=1..111.

Formula

a(n) = A001221(100^n-3).

a(n) = A105068(2*n). - Amiram Eldar, Jan 25 2020

Example

If n = 1, then 100^1 - 3 = 97 which is prime so the first term is 1.

Maple

A105069 := proc(n) 100^n-3 ; numtheory[factorset](%) ; nops(%) ; end proc: # R. J. Mathar, Aug 24 2011

Mathematica

Table[PrimeNu[(100)^n - 3], {n, 1, 50}] (* G. C. Greubel, May 07 2017 *)

Crossrefs

Cf. A001221, A105068.

Sequence in context: A060447 A268045 A118177 * A172008 A100825 A216452

Adjacent sequences: A105066 A105067 A105068 * A105070 A105071 A105072

Keyword

nonn

Author

Parthasarathy Nambi, Apr 05 2005

Extensions

a(31)-a(60) from Amiram Eldar, Jan 25 2020

a(61)-a(66) from Jinyuan Wang, Apr 01 2020

a(67)-a(111) from Michael S. Branicky, Apr 14 2023 using factorbd.com

Status

approved