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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 (list; graph; refs; listen; history; text; internal format)
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

LINKS

Table of n, a(n) for n=1..29.

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 * A010381 A095033 A010399

Adjacent sequences:  A192239 A192240 A192241 * A192243 A192244 A192245

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 01 2011

EXTENSIONS

More terms from Dana Jacobsen, Apr 30 2015

STATUS

approved

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Last modified April 7 04:20 EDT 2020. Contains 333292 sequences. (Running on oeis4.)