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

1,1

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]

Links

Table of n, a(n) for n=1..100.

Formula

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

Example

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.

Crossrefs

Sequence in context: A265157 A054263 A308656 * A124874 A230258 A016459

Adjacent sequences: A178772 A178773 A178774 * A178776 A178777 A178778

Keyword

fini,nonn,base

Author

Reinhard Zumkeller, Jun 11 2010

Extensions

Edited by Charles R Greathouse IV, Aug 02 2010

Status

approved