A064008 a(n) = (10^n - 1)/9*prime(n).

2, 33, 555, 7777, 122221, 1444443, 18888887, 211111109, 2555555553, 32222222219, 344444444441, 4111111111107, 45555555555551, 477777777777773, 5222222222222217, 58888888888888883, 655555555555555549, 6777777777777777771, 74444444444444444437, 788888888888888888881

Offset

1,1

Links

Harry J. Smith, Table of n, a(n) for n = 1..100

Formula

a(n) = A002275(n)*A000040(n). - Michel Marcus, Jun 22 2018

Mathematica

Table[(10^n - 1) / 9 Prime[n], {n, 20}] (* Vincenzo Librandi, Jun 22 2018 *)

Prog

(PARI) for(n=1, 22, print((10^n-1)/9*prime(n)))
(PARI) { for (n=1, 100, write("b064008.txt", n, " ", (10^n - 1)/9*prime(n)) ) } \\ Harry J. Smith, Sep 05 2009
(Magma) [(10^n - 1) / 9*NthPrime(n): n in [1..20]]; // Vincenzo Librandi, Jun 22 2018

Crossrefs

Cf. A000040, A002275.

Sequence in context: A118117 A231794 A083143 * A093752 A045984 A077657

Adjacent sequences: A064005 A064006 A064007 * A064009 A064010 A064011

Keyword

nonn

Author

Jason Earls, Sep 14 2001

Status

approved