A177507 Primes of the form 4*10^n+3.

7, 43, 4003, 40000003, 40000000003, 40000000000000000000000000000000000000003

Offset: 1

Author

Vincenzo Librandi, Dec 11 2010

Keywords

• nonn

Comments

a(9) has 1738 digits. - Vincenzo Librandi, Jan 03 2014

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..8
• Makoto Kamada, Prime numbers of the form 400...003.

Crossrefs

Cf. A101397.

Programs

Magma

[a: n in [0..250] | IsPrime(a) where a is 4*10^n+3];

Mathematica

Select[Table[4 10^n + 3, {n, 0, 300}], PrimeQ] (* Vincenzo Librandi, Jan 03 2014 *)