OFFSET
1,1
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..150
Paul Leyland, Factors of Cullen and Woodall numbers
Paul Leyland, Generalized Cullen and Woodall numbers
Index entries for linear recurrences with constant coefficients, signature (11,-35,25).
FORMULA
G.f.: x*(4 + 5*x - 25*x^2)/((1 - 5*x)^2*(1 - x)). - Vincenzo Librandi, Jun 21 2018
a(n) = A036291(n) - 1. - Michel Marcus, Jun 21 2018
MATHEMATICA
Table[n*5^n-1, {n, 20}] (* or *) LinearRecurrence[{11, -35, 25}, {4, 49, 374}, 20] (* Harvey P. Dale, Jun 25 2017 *)
CoefficientList[Series[(4 + 5 x - 25 x^2) / ((1 - 5 x)^2 (1 - x)), {x, 0, 33}], x] (* Vincenzo Librandi, Jun 21 2018 *)
PROG
(PARI) { for (n=1, 150, write("b064751.txt", n, " ", n*5^n - 1) ) } \\ Harry J. Smith, Sep 24 2009
(Magma) [n*5^n - 1: n in [1..30]]; // Vincenzo Librandi, Jun 21 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 19 2001
STATUS
approved