A344424 Numbers k such that A344423(k) is prime.
3, 54, 58, 64, 70, 253, 438, 4255, 8770
Offset: 1
Examples
A344423(3) = 100111001 is prime, so 3 is a term of the sequence.
Programs
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PARI
is(n) = ispseudoprime(10^(2*n+2) + 111*10^n + 1)
Extensions
a(9) from Hugo Pfoertner, May 19 2021
Comments