OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..10000
Émile Fourrey, Le nombre 37, Récreations arithmétiques, 1899 and later, Vuibert, Paris, page 11.
Index entries for linear recurrences with constant coefficients, signature (2,-1).
FORMULA
G.f.: 111*x/(x-1)^2.
a(n) = 2*a(n-1) - a(n-2).
a(n) = a(n-1) + 111.
E.g.f.: 111*x*exp(x). - Stefano Spezia, Sep 15 2023
PROG
(Magma) [111*n: n in [1..50]]; // Vincenzo Librandi, Aug 04 2011
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Paul Curtz, May 13 2010
STATUS
approved