OFFSET
1,1
LINKS
Robert Price, Table of n, a(n) for n = 1..36
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