|
Search: id:A058250
|
|
|
| A058250 |
|
GCD of n-th primorial number and its totient. |
|
+0
3
|
|
| 1, 2, 2, 6, 30, 30, 30, 30, 330, 2310, 2310, 2310, 2310, 2310, 53130, 690690, 20030010, 20030010, 20030010, 20030010, 20030010, 20030010, 821230410, 821230410, 821230410, 821230410, 13960916970, 739928599410, 739928599410
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
FORMULA
|
a(n) = GCD[A002110(n), A000010(A002110(n)] = GCD[A002110(n), A005867(n)].
|
|
EXAMPLE
|
a(6)=GCD(30030,5760)=30
|
|
MAPLE
|
[seq(igcd(product(ithprime(k), k=1..m), product(ithprime(k)-1, k=1..m)), m=1..50)];
|
|
CROSSREFS
|
A002110, A000010, A005867.
Adjacent sequences: A058247 A058248 A058249 this_sequence A058251 A058252 A058253
Sequence in context: A032272 A004304 A108800 this_sequence A067644 A097801 A052584
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Labos E. (labos(AT)ana.sote.hu), Dec 05 2000
|
|
|
Search completed in 0.002 seconds
|
