A340736 Prime values in A067439, in the order in which they appear.

5, 19, 83, 89, 151, 167, 107, 71, 233, 163, 173, 359, 523, 317, 751, 569, 613, 587, 941, 823, 2293, 1741, 1873, 3541, 3907, 2179, 7817, 3907, 2683, 3433, 6277, 6577, 4787, 8807, 9661, 20051, 9403, 10267, 23909, 16927, 8779, 14437, 14887, 31231, 18191, 13883, 14281, 37987, 38839, 14629, 22159

Offset: 1

Author

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

Keywords

• nonn

Comments

3907 occurs twice, as a(25) and a(28). Are there any others?

Examples

			a(3) = 83 because 83 = A067439(25) is the third prime value to occur in A067439.
		

Links

• Robert Israel, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A067439, A340731.

Programs

Maple

f:= proc(n) local t, k;
   t:= add(`if`(igcd(n, k)=1, n mod k, 0), k=2..n-1);
   if isprime(t) then t fi
end proc:
map(f, [$1..1000]);

Formula

a(n) = A067439(A340731(n)).