A173041 a(n) = 2*10^n + 3.

5, 23, 203, 2003, 20003, 200003, 2000003, 20000003, 200000003, 2000000003, 20000000003, 200000000003, 2000000000003, 20000000000003, 200000000000003, 2000000000000003, 20000000000000003, 200000000000000003

Offset: 0

Author

Vincenzo Librandi, Feb 08 2010

Keywords

• nonn
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..200
• Index entries for linear recurrences with constant coefficients, signature (11, -10).

Crossrefs

Cf. A081677 (numbers n such that 2*10^n + 3 is prime), A101951 (numbers n such that 20*10^n + 3 is prime). - Klaus Brockhaus, Feb 28 2010

Programs

Magma

[2*10^n + 3: n in [0..20]]; // Vincenzo Librandi, Apr 05 2013

Mathematica

CoefficientList[Series[(5 - 32 x)/((1 - x) (1 - 10 x)), {x, 0, 20}], x] (* Vincenzo Librandi, Apr 05 2013 *)
Table[2*10^n+3,{n,0,20}] (* Harvey P. Dale, Jun 01 2019 *)

Formula

G.f.: (5-32*x)/((1-x)*(1-10*x)). - Vincenzo Librandi, Apr 05 2013