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A273044 Discriminator of A003095. 2
1, 2, 5, 9, 10, 10, 17, 29, 29, 29, 47, 47, 47, 61, 71, 71, 71, 101, 109, 121, 121, 121, 121, 139, 139, 139, 139, 139, 139, 139, 139, 139, 139, 274, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278, 278 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
The discriminator of a sequence is the least integer k such that the first n terms are pairwise incongruent, modulo k.
LINKS
MAPLE
N:= 1000: # to get a(1)..a(n)
nmax:= 0:
for m from 1 while nmax <= N do
a:= 1 mod m; A:= {a};
for n from 1 while nops(A) = n do
a:= a^2 +1 mod m;
A:= A union {a};
od:
for k from nmax+1 to n-1 do v[k]:= m od:
nmax:= max(nmax, n-1);
od:
seq(v[k], k=1..N); # Robert Israel, May 13 2016
CROSSREFS
Sequence in context: A002580 A196408 A091656 * A133508 A125969 A070240
KEYWORD
nonn
AUTHOR
Jeffrey Shallit, May 13 2016
EXTENSIONS
a(31)-a(56) from Robert Israel, May 13 2016
STATUS
approved

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Last modified May 23 22:02 EDT 2024. Contains 372765 sequences. (Running on oeis4.)