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A192242
Positions of primes within Dana Scott's sequence (A048736).
3
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
1,1
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
PROG
(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
CROSSREFS
Sequence in context: A217128 A036668 A260997 * A209321 A010381 A095033
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jul 01 2011
EXTENSIONS
More terms from Dana Jacobsen, Apr 30 2015
STATUS
approved