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 A009056 Numbers >= 3. 4
 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Same as Pisot sequences E(3,4), P(3,4), T(3,4). See A008776 for definitions of Pisot sequences. Non-Fermat-exponents, positive integers n such that there are no solutions in positive integers of the equation a^n+b^n = c^n. [Tanya Khovanova, Jul 09 2011] Sums of twin primes. - Charles R Greathouse IV, Jun 21 2012 LINKS Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA a(n) = n+2. O.g.f.: x*(3-2*x)/(1-x)^2. a(n)=A009005(n-1), n>2. - R. J. Mathar, May 26 2008 MATHEMATICA Range[3, 80] (* Harvey P. Dale, Sep 26 2017 *) PROG (PARI) a(n)=n+2 \\ Charles R Greathouse IV, Jun 21 2012 CROSSREFS Sequence in context: A171950 A184985 A114637 * A065475 A062983 A081311 Adjacent sequences:  A009053 A009054 A009055 * A009057 A009058 A009059 KEYWORD easy,nonn AUTHOR STATUS approved

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Last modified January 23 19:25 EST 2019. Contains 319404 sequences. (Running on oeis4.)