

A050676


Let b(n) = number of prime factors (with multiplicity) of concatenation of numbers from 1 to n; sequence gives smallest number m with b(m) = n.


1




OFFSET

1,2


LINKS

Table of n, a(n) for n=1..10.
P. De Geest, Normal Smarandache Concatenated Numbers, Prime factors from 1 up to n
C. Rivera, Primes by Listing
M. Fleuren, Factors and primes of Smarandache sequences.
M. Fleuren, Smarandache Factors and Reverse factors


MATHEMATICA

Join[{1}, Table[i=1; While[PrimeOmega[FromDigits[Flatten[IntegerDigits[Range[i]]]]]!=n, i++]; i, {n, 2, 10}]] (* Jayanta Basu, May 30 2013 *)


CROSSREFS

Cf. A007908, A050678, A046460.
Sequence in context: A201926 A288055 A081233 * A010372 A199455 A287768
Adjacent sequences: A050673 A050674 A050675 * A050677 A050678 A050679


KEYWORD

nonn,base,hard


AUTHOR

Patrick De Geest, Aug 15 1999


STATUS

approved



