|
| |
|
|
A131931
|
|
Smallest number containing exactly n prime factors in its decimal representation.
|
|
2
|
| |
|
|
|
OFFSET
|
0,2
|
|
|
COMMENTS
|
A131929(a(n)) = n and A131929(m) <> n for m<a(n).
|
|
|
LINKS
|
Table of n, a(n) for n=0..8.
|
|
|
EXAMPLE
|
a(2) = 2^2 * 3 * 11 = 132 containing 2 and 3;
a(3) = 3 * 5 * 7^2 = 735 containing 3, 5 and 7;
a(4) = 2^2 * 3 * 13 * 137 = 21372 containing 2, 3, 13 and 137;
a(5) = 2 * 3 * 7^2 * 13 * 71 = 271362 containing 2, 3, 7, 13 and 71.
|
|
|
CROSSREFS
|
Cf. A131930, A131929, A318965.
Sequence in context: A119778 A071606 A080282 * A020524 A157071 A174585
Adjacent sequences: A131928 A131929 A131930 * A131932 A131933 A131934
|
|
|
KEYWORD
|
nonn,base,more
|
|
|
AUTHOR
|
Reinhard Zumkeller, Jul 30 2007
|
|
|
EXTENSIONS
|
Offset changed by and a(6)-a(8) from Giovanni Resta, Sep 06 2018
|
|
|
STATUS
|
approved
|
| |
|
|
