A296482 - OEIS

%I #4 Jan 06 2018 11:01:08

%S 7,0,9,0,7,0,0,6,8,7,3,5,5,1,4,2,8,8,1,1,6,7,7,4,7,5,2,6,5,0,3,3,7,1,

%T 2,1,5,9,2,1,8,4,1,1,4,6,6,7,4,7,0,1,0,3,6,6,9,0,6,0,7,5,9,3,3,6,3,2,

%U 5,5,4,8,7,9,1,6,3,6,2,1,8,8,7,8,3,5

%N Decimal expansion of limiting power-ratio for A295952; see Comments.

%C Suppose that A = (a(n)), for n >= 0, is a sequence, and g is a real number such that a(n)/a(n-1) -> g. The limiting power-ratio for A is the limit as n->oo of a(n)/g^n, assuming that this limit exists. For A = A295952, we have g = (1 + sqrt(5))/2, the golden ratio (A001622). See the guide at A296469 for related sequences.

%e limiting power-ratio = 7.090700687355142881167747526503371215921...

%t a[0] = 1; a[1] = 5; b[0] = 2; b[1 ] = 3; b[2] = 4;

%t a[n_] := a[n] = a[n - 1] + a[n - 2] + b[n];

%t j = 1; While[j < 13, k = a[j] - j - 1;

%t  While[k < a[j + 1] - j + 1, b[k] = j + k + 2; k++]; j++];

%t Table[a[n], {n, 0, k}]; (* A295952 *)

%t z = 2000; g = GoldenRatio; h = Table[N[a[n]/g^n, z], {n, 0, z}];

%t StringJoin[StringTake[ToString[h[[z]]], 41], "..."]

%t Take[RealDigits[Last[h], 10][[1]], 120]   (* A296482 *)

%Y Cf. A001622, A295952, A296284, A296481.

%K nonn,easy,cons

%O 1,1

%A _Clark Kimberling_, Jan 06 2018