|
| |
|
|
A100778
|
|
Integer powers of primorial numbers.
|
|
1
| |
|
|
1, 2, 4, 6, 8, 16, 30, 32, 36, 64, 128, 210, 216, 256, 512, 900, 1024, 1296, 2048, 2310, 4096, 7776, 8192, 16384, 27000, 30030, 32768, 44100, 46656, 65536, 131072, 262144, 279936, 510510, 524288, 810000, 1048576, 1679616, 2097152, 4194304, 5336100
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| Smallest squarefree numbers or their powers with distinct prime signatures. Or least numbers with prime signatures (p*q*r*...)^k, where p,q,r,... are primes and k is a whole number.
|
|
|
EXAMPLE
| 10 is not a member as 6 is a member with the same prime signature 10>6.
216 is a member as 216 = (2*3)^3. 243 is not a member as 32 represents that prime signature.
|
|
|
CROSSREFS
| Cf. A002110.
Sequence in context: A064408 A100685 A068799 * A122408 A100055 A104001
Adjacent sequences: A100775 A100776 A100777 * A100779 A100780 A100781
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 28 2004
|
|
|
EXTENSIONS
| More terms and simpler definition from Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 29 2004
|
| |
|
|
