OFFSET
1,1
LINKS
Robert Price, Table of n, a(n) for n = 1..48
MATHEMATICA
a[1]=53; a[n_] := First[ Flatten[ FactorInteger[ 1+Product[ a[ j ], {j, n-1} ] ] ] ]; Array[a, 15]
PROG
(PARI) spf(n)=my(f=factor(n)[1, 1]); f
first(m)=my(v=vector(m)); v[1]=53; for(i=2, m, v[i]=spf(1+prod(j=1, i-1, v[j]))); v \\ Anders Hellström, Nov 26 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
STATUS
approved