|
|
A071634
|
|
Number of terms in the set InvPhi(1048576*p(n)), where p(n) is the n-th prime.
|
|
7
|
|
|
23, 112, 81, 64, 75, 48, 36, 28, 43, 68, 14, 80, 35, 50, 0, 43, 28, 28, 46, 52, 44, 32, 38, 49, 48, 37, 10, 34, 24, 47, 34, 65, 19, 28, 59, 20, 32, 82, 15, 30, 61, 32, 48, 62, 10, 32, 2, 26, 18, 16, 65, 77, 0, 46, 8, 0, 43, 18, 56, 60, 0, 38, 40, 13, 36, 26, 44, 46, 41, 12, 0
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
EXAMPLE
|
Invphi(1048576*211)={221249537,442499074}, a(47)=2. Observe that a(15)=0 because 47 needs a very large 2^i multiplier (instead of 1048576) to give a nonempty InvPhi set.
|
|
MAPLE
|
>[seq(nops(invphi(1048576*ithprime(i))), i=1..128)];
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|