Search: a046467 -id:a046467
|
| |
|
|
A046460
|
|
Number of prime factors of concatenation of numbers from 1 up to n, with multiplicity.
|
|
+10
10
|
|
|
|
0, 3, 2, 2, 3, 8, 2, 5, 4, 3, 6, 6, 3, 3, 3, 4, 5, 6, 6, 10, 8, 6, 4, 6, 5, 9, 8, 7, 4, 7, 3, 6, 6, 2, 8, 9, 4, 4, 6, 9, 5, 7, 4, 7, 10, 7, 5, 8, 6, 10, 3, 9, 8, 14, 5, 5, 6, 4, 4, 8, 3, 8, 5, 10, 6, 8, 3, 10, 7, 6, 6, 7, 3, 9, 6, 6, 5, 6, 6, 10, 6, 7, 6, 7, 6
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
|
|
|
MATHEMATICA
|
Join[{1}, Table[PrimeOmega[FromDigits[Flatten[IntegerDigits[Range[i]]]]], {i, 2, 35}]] (* Jayanta Basu, Jun 02 2013 *)
|
|
|
PROG
|
(PARI) conc(n) = my(s=""); for(k=1, n, s=Str(s, k)); eval(s); \\ A007908
|
|
|
CROSSREFS
|
|
|
|
KEYWORD
|
nonn,hard,base
|
|
|
AUTHOR
|
|
|
|
EXTENSIONS
|
|
|
|
STATUS
|
approved
|
| |
|
Search completed in 0.005 seconds
|
