A177134 Primes of the form 2*10^k + 3.

5, 23, 2003, 200003, 2000003, 20000003, 2000000000003, 20000000000000003, 200000000000000003, 20000000000000000000003, 2000000000000000000000003, 200000000000000000000000000000000003

Offset: 1

Author

Vincenzo Librandi, Dec 10 2010

Keywords

• nonn

Links

• Makoto Kamada, Prime numbers of the form 200...003.

Crossrefs

Cf. A081677, A101951, A173041.

Programs

Magma

[ a: n in [0..250] | IsPrime(a) where a is 2*10^n + 3 ];

Formula

a(n) = A173041(A081677(n)).