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Numbers n for which the expression 5^n/(n-1) is an integer. - Paolo P. Lava, May 29 2006
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a(n) is the deficiency of 3 * 5^n (see A033879). - Patrick J. McNab, May 28 2017
a(n) = 5*a(n-1) - 4 = 6*with a(n-10) - 5*a(n-= 2).
a(n) = 6*a(n-1) - 5*a(n-2) for n > 1.
G.f.: 1/(1-x) + 1/(1-5*x) = (2-6*x)/((1-x)*(1-5*x)).
E.g.f.: e^exp(x ) + e^exp(5*x). (End)
From Elmo R. Oliveira, Dec 06 2023: (Start)
a(n) = A000351(n) + 1.
a(n) = 2*A034478(n). (End)
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(MAGMAMagma) [5^n+1: n in [0..30]]; // Vincenzo Librandi, Jan 11 2017
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Amelia Carolina Sparavigna, <a href="https://doi.org/10.18483/ijSci.2188">Some Groupoids and their Representations by Means of Integer Sequences</a>, International Journal of Sciences (2019) Vol. 8, No. 10.
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