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 A164786 a(n) = 8^n-7. 3
 1, 57, 505, 4089, 32761, 262137, 2097145, 16777209, 134217721, 1073741817, 8589934585, 68719476729, 549755813881, 4398046511097, 35184372088825, 281474976710649, 2251799813685241, 18014398509481977, 144115188075855865 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Minoli defined the sequences and concepts that follow in the 1980 IEEE paper below: - Sequence m(n,t) = (n^t) - (n-1) for t=2 to infinity is called a Mersenne Sequence Rooted on n - If n is prime, this sequence is called a Legitimate Mersenne Sequence - Any j belonging to the sequence m(n,t) is called a Generalized Mersenne Number (n-GMN) - If j belonging to the sequence m (n,t) is prime, it is then called a n-Generalized Mersenne Prime (n-GMP). Note: m (n,t) = n* m (n,t-1) + n^2 - 2*n+1. This sequence related to sequences: A014232 and A014224; A135535 and A059266. These numbers play a role in the context of hyperperfect numbers. For additional references, beyond key ones listed below, see A164783. REFERENCES Daniel Minoli, Voice over MPLS, McGraw-Hill, New York, NY, 2002, ISBN 0-07-140615-8 (p.114-134) LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 Daniel Minoli and Robert Bear, Hyperperfect Numbers, Pi Mu Epsilon Journal, Fall 1975, pp. 153-157. Daniel Minoli, W. Nakamine, Mersenne Numbers Rooted On 3 For Number Theoretic Transforms, 1980 IEEE International Conf. on Acoust., Speech and Signal Processing. Index entries for linear recurrences with constant coefficients, signature (9, -8). FORMULA a(n) = 8*a(n-1)+49, with a(1)=1. - Vincenzo Librandi, Nov 30 2010 G.f.: x*(1+48*x)/(1-9*x+8*x^2). a(n) = 9*a(n-1)-8*a(n-2). - Colin Barker, Jan 28 2012 E.g.f.: 6 + (exp(7*x) - 7)*exp(x). - Ilya Gutkovskiy, Jun 11 2016 MATHEMATICA 8^Range-7 (* or *) LinearRecurrence[{9, -8}, {1, 57}, 20] (* Harvey P. Dale, Jan 24 2013 *) PROG (Magma) [8^n-7: n in [1..20]]; // Vincenzo Librandi, Aug 22 2011 CROSSREFS Sequence in context: A218812 A290779 A027143 * A240416 A264240 A166392 Adjacent sequences: A164783 A164784 A164785 * A164787 A164788 A164789 KEYWORD nonn,easy AUTHOR Daniel Minoli (daniel.minoli(AT)ses.com), Aug 26 2009 EXTENSIONS More terms a(7)-a(19) from Vincenzo Librandi, Oct 29 2009 STATUS approved

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Last modified March 25 20:04 EDT 2023. Contains 361528 sequences. (Running on oeis4.)