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A177190 Primes of the form 5*10^n - 3. 0
2, 47, 4999999999999997, 499999999999999999999999999999999999999997, 49999999999999999999999999999999999999999999999999999999999999997 (list; graph; refs; listen; history; text; internal format)
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: A087265 A079307 A005814 * A087259 A195876 A326778

Adjacent sequences:  A177187 A177188 A177189 * A177191 A177192 A177193

KEYWORD

nonn

AUTHOR

Vincenzo Librandi, Dec 10 2010

STATUS

approved

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Last modified May 8 05:23 EDT 2021. Contains 343653 sequences. (Running on oeis4.)