|
|
A051331
|
|
Euclid-Mullin sequence (A000945) with initial value a(1)=131071 instead of a(1)=2.
|
|
1
|
|
|
131071, 2, 3, 43, 31, 113, 5, 13, 4391, 7, 8012161, 3090097, 17, 809, 83843, 18743, 29, 179, 2347, 83, 97883, 14411, 12109, 97, 25951, 5506100565736709510249607377685096261432096111292821492562747465234861171
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
LINKS
|
|
|
MATHEMATICA
|
a[1]=131071; a[n_] := First[ Flatten[ FactorInteger[ 1+Product[ a[ j ], {j, 1, n-1} ] ] ] ]; Array[a, 10]
|
|
PROG
|
(PARI) gpf(n)=my(f=factor(n)[, 1]); f[#f];
first(m)=my(v=vector(m)); v[1]=131071; for(i=2, m, v[i]=gpf(1+prod(j=1, i-1, v[j]))); v \\ Anders Hellström, Nov 25 2015
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|