A177190 Primes of the form 5*10^n - 3.

2, 47, 4999999999999997, 499999999999999999999999999999999999999997, 49999999999999999999999999999999999999999999999999999999999999997

Offset

1,1

Comments

The next term has 132 digits. - Harvey P. Dale, Jun 29 2011

Links

Table of n, a(n) for n=1..5.

Mathematica

Join[{2}, Select[10#+7&/@(FromDigits/@Table[PadRight[{4, 9}, n, 9], {n, 150}]), PrimeQ]] (* Harvey P. Dale, Jun 29 2011 *)

Prog

(Magma) [a: n in [0..250] | IsPrime(a) where a is 5*10^n-3];

Crossrefs

Cf. A103003.

Sequence in context: A079307 A368193 A005814 * A087259 A195876 A326778

Adjacent sequences: A177187 A177188 A177189 * A177191 A177192 A177193

Keyword

nonn

Author

Vincenzo Librandi, Dec 10 2010

Status

approved