A177418 Primes of the form 10^k - 59.

41, 941, 9941, 99999941, 99999999999999999941, 99999999999999999999999999999999999941, 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999941

Offset: 1

Author

Vincenzo Librandi, Dec 11 2010

Keywords

• nonn
• changed

Comments

The next term (a(8)) has 248 digits. - Harvey P. Dale, Dec 29 2011

Links

• Jason Yuen, Table of n, a(n) for n = 1..15

Crossrefs

Cf. A108506.

Programs

Magma

[a: n in [2..250] | IsPrime(a) where a is 10^n-59];

Mathematica

Select[10^Range[0,400] - 59,PrimeQ] (* Harvey P. Dale, Dec 29 2011 *)
Select[Table[FromDigits[PadLeft[{4,1},n,9]],{n,2,400}],PrimeQ] (* Harvey P. Dale, Feb 08 2024 *)

Formula

a(n) = 10^A108506(n) - 59. - Jason Yuen, Sep 01 2025