|
|
A066560
|
|
Smallest composite number divisible by n.
|
|
2
|
|
|
4, 4, 6, 4, 10, 6, 14, 8, 9, 10, 22, 12, 26, 14, 15, 16, 34, 18, 38, 20, 21, 22, 46, 24, 25, 26, 27, 28, 58, 30, 62, 32, 33, 34, 35, 36, 74, 38, 39, 40, 82, 42, 86, 44, 45, 46, 94, 48, 49, 50, 51, 52, 106, 54, 55, 56, 57, 58, 118, 60, 122, 62, 63, 64, 65, 66, 134, 68, 69, 70
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
FORMULA
|
For n>=2: a(n) = 2*n if n prime; otherwise a(n) = n.
|
|
PROG
|
(PARI) { for (n=1, 1000, if (isprime(n), a=2*n, a=n); if (n==1, a=4); write("b066560.txt", n, " ", a) ) } \\ Harry J. Smith, Mar 02 2010
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
More terms and formula from Francisco Salinas (franciscodesalinas(AT)hotmail.com), Dec 24 2001
|
|
STATUS
|
approved
|
|
|
|