OFFSET
1,3
LINKS
Dario Alejandro Alpern, Factorization using the Elliptic Curve Method.
Hisanori Mishima, Smarandache consecutive prime sequences (n = 1 to 100).
EXAMPLE
The number of distinct prime factors of 2 is 1 since it is a prime.
The number of distinct prime factors of 23 is 1 since it is a prime.
The number of distinct prime factors of 235 is 2.
The number of distinct prime factors of 2357 is 1 since it is a prime.
MATHEMATICA
f[n_] := Length[ FactorInteger[ FromDigits[ Flatten[ Table[ IntegerDigits[ Prime[i]], {i, n}]] ]]]; Table[ f[n], {n, 15}] (* Robert G. Wilson v, Feb 22 2005 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Parthasarathy Nambi, Feb 08 2005
EXTENSIONS
More terms from Robert G. Wilson v, Feb 22 2005
STATUS
approved