A248547 Numbers n such that 75^n+2 is prime.

0, 12, 28, 53, 65, 504, 1967, 6915

Offset: 1

Author

Vaclav Kotesovec, Oct 08 2014

Keywords

• nonn
• more

Comments

Dedicated to N. J. A. Sloane for his 75th birthday!

Next term, if it exists, is greater than 10000.

Next term, if it exists, is greater than 50000. - Michael S. Branicky, May 21 2025

Crossrefs

Cf. A051783, A087885, A090649, A109076, A138048, A113480, A138049, A138050.

Programs

Magma

[n: n in [0..200] | IsPrime(75^n+2)]; // Vincenzo Librandi, Oct 08 2014

Mathematica

Select[Range[0, 1000], PrimeQ[75^# + 2] &]

PARI

is(n)=ispseudoprime(75^n+2) \\ Charles R Greathouse IV, Jun 13 2017