A178775 Smallest prime factors of zerofull restricted pandigital numbers.

3, 2, 3, 3, 2, 3, 3, 2, 3, 2, 2, 2, 3, 3, 3, 2, 3, 2, 2, 3, 2, 2, 3, 2, 3, 2, 3, 3, 2, 3, 3, 2, 3, 3, 2, 3, 3, 3, 3, 3, 3, 3, 2, 3, 2, 3, 3, 3, 3, 2, 3, 2, 2, 2, 3, 2, 3, 3, 2, 3, 3, 2, 3, 3, 2, 3, 2, 2, 2, 3, 2, 3, 3, 3, 3, 2, 3, 2, 3, 3, 3, 3, 3, 3, 3, 2, 3, 3, 2, 3, 3, 2, 3, 3, 2, 3, 2, 3, 2, 2

Offset: 1

Author

Reinhard Zumkeller, Jun 11 2010

Keywords

• fini
• nonn
• base

Comments

a(n) = A020639(A050278(n)); 2 <= a(n) <= 3.

a(n) is 2 1653120 times and 3 1612800 times, making the average value 202/81 = 2.493.... [Charles R Greathouse IV, Sep 09 2011]

Examples

			A050278(1)=1023456789=3*3*3*3*2221*5689 --> a(1)=3;
A050278(10)=1023457896=2*2*2*3*3*3*59*80309 --> a(10)=2;
A050278(100)=1023495786=2*3*3*739*76943 --> a(100)=2;
A050278(1000)=1024658793=3*3*113850977 --> a(1000)=3.
		

Formula

a(n) = 2 + A000035(A050278(n)).

Extensions

Edited by Charles R Greathouse IV, Aug 02 2010