A192242 Positions of primes within Dana Scott's sequence (A048736).

4, 5, 6, 7, 9, 11, 14, 19, 25, 27, 38, 208, 289, 433, 529, 1069, 1163, 1801, 5185, 5630, 8148, 9731, 11124, 23787, 46056, 64182, 82629, 92124, 97221

Offset: 1

Author

Reinhard Zumkeller, Jul 01 2011

Keywords

• nonn

Comments

A048736(a(n)) = A192241(n).

Larger entries are probable primes (BPSW plus random-base M-R). Values below a(n)=8148 have been proven prime. - Dana Jacobsen, Apr 30 2015

Programs

Perl

use ntheory ":all";
use Math::GMPz;
my @a = map { Math::GMPz->new($_) } (1,1,1,1); for (1..100000) {  push @a, ($a[-2]+$a[-1]*$a[-3])/$a[-4];  say ++$i," $#a" if is_prime($a[-1]); }
# Dana Jacobsen, Apr 30 2015

Extensions

More terms from Dana Jacobsen, Apr 30 2015