A340744 Primes in A340618, in the order in which they occur.

31, 23, 19, 43, 73, 53, 43, 37, 61, 43, 83, 73, 43, 73, 53, 67, 79, 73, 61, 59, 173, 151, 109, 223, 163, 109, 127, 109, 109, 233, 109, 109, 163, 139, 113, 109, 109, 181, 109, 109, 523, 353, 199, 383, 331, 199, 223, 313, 199, 173, 163, 271, 229, 211, 199, 199, 751, 503, 433, 307, 229, 313, 2411

Offset: 1

Author

J. M. Bergot and Robert Israel, Jan 18 2021

Keywords

• nonn
• look

Examples

			a(4) = A316650(23) = 43 is the fourth term in A316650 that is prime.
		

Crossrefs

Cf. A316650, A340618.

Programs

Maple

f:= proc(n) local a, b, c,p;
  c:= convert(convert(n, base, 10), `+`);
  a:= floor(n/c);
  b:= n mod c;
  p:= 10^(1+ilog10(b))*a+b;
  if isprime(p) then p fi;
end proc:
map(f, [$1..1000]);

Formula

a(n) = A316650(A340618(n)).