|
|
A069875
|
|
Smallest multiple of n with a prime signature different from all previous terms.
|
|
0
|
|
|
1, 2, 6, 4, 20, 24, 42, 8, 36, 60, 176, 72, 312, 210, 180, 16, 544, 144, 912, 320, 420, 792, 2208, 216, 800, 1560, 243, 896, 4176, 900, 5580, 64, 2112, 3570, 1680, 432, 7992, 4864, 3744, 1600, 14760, 2688, 18060, 4752, 1800, 11040, 24064, 864, 6272, 3600
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,2
|
|
LINKS
|
|
|
EXAMPLE
|
a(1) through a(4) have prime signatures 0, 1, (1, 1) and 2. a(5) = 20 because 5 has prime signature 1, which has already been used and 10 and 15 have prime signature (1, 1), which has already been used, but 20 has prime signature (2, 1), which has not yet been used.
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
EXTENSIONS
|
|
|
STATUS
|
approved
|
|
|
|