PROG
(MAGMAMagma) [8^n + 1: n in [0..40] ]; // Vincenzo Librandi, Apr 30 2011
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(MAGMAMagma) [8^n + 1: n in [0..40] ]; // Vincenzo Librandi, Apr 30 2011
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LinearRecurrence[{9, -8}, {2, 9}, 20] (* Harvey P. Dale, Jan 24 2019 *)
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a(n) = 8^n + 1.
Any number of the form b^k+1 is composite for b>2 and k odd since b+1 algebraically divides b^k+1. - _Robert G. Wilson v _, Aug 25 2002.
<a href="/index/ReaRec#recLCCorder_02">Index entries for linear recurrences with constant coefficients</a>, signature (9,-8).
E.g.f.: e^x+e^(8*x). [From _- _Mohammad K. Azarian_, Jan 02 2009]
(MAGMA) [8^n + 1: n in [0..40] ]; // _Vincenzo Librandi, _, Apr 30 2011
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E.g.f.: e^x+e^(8*x). [From __Mohammad K. Azarian__, , Jan 02 2009]
E.g.f.: e^x+e^(8*x). [From __Mohammad K. Azarian_, _, Jan 02 2009]