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A009981
Powers of 37.
14
1, 37, 1369, 50653, 1874161, 69343957, 2565726409, 94931877133, 3512479453921, 129961739795077, 4808584372417849, 177917621779460413, 6582952005840035281, 243569224216081305397, 9012061295995008299689
OFFSET
0,2
COMMENTS
Same as Pisot sequences E(1, 37), L(1, 37), P(1, 37), T(1, 37). Essentially same as Pisot sequences E(37, 1369), L(37, 1369), P(37, 1369), T(37, 1369). See A008776 for definitions of Pisot sequences.
The compositions of n in which each natural number is colored by one of p different colors are called p-colored compositions of n. For n>=1, a(n) equals the number of 37-colored compositions of n such that no adjacent parts have the same color. - Milan Janjic, Nov 17 2011
Numbers n such that sigma(37*n) = 37*n + sigma(n). - Jahangeer Kholdi, Nov 23 2013
REFERENCES
C. W. Trigg, The Powers of 37, Journal of Recreational Mathematics, Vol. 12:3 (1979-80), 186-191.
FORMULA
G.f.: 1/(1-37*x). - Philippe Deléham, Nov 24 2008
a(n)=37^n; a(n)=37*a(n-1) n>0 a(0)=1. - Vincenzo Librandi, Nov 21 2010
MATHEMATICA
37^Range[0, 20] (* or *)
NestList[37*# &, 1, 20] (* Paolo Xausa, Feb 21 2024 *)
PROG
(Magma)[37^n: n in [0..20]]; // Vincenzo Librandi, Nov 21 2010
(PARI) a(n)=37^n \\ Charles R Greathouse IV, Oct 07 2015
CROSSREFS
Sequence in context: A188771 A207185 A189061 * A370334 A097315 A158741
KEYWORD
nonn,easy
EXTENSIONS
Reference added by William Rex Marshall, Nov 13 2010
STATUS
approved