

A120256


a(n) = number of terms in the nth row of A120255(n) = number of terms in A001177 equal to n.


4



1, 0, 1, 1, 1, 2, 1, 2, 2, 2, 1, 10, 1, 2, 5, 4, 1, 10, 3, 11, 5, 2, 1, 55, 4, 2, 12, 11, 1, 52, 3, 8, 5, 2, 5, 133, 7, 4, 5, 46, 3, 52, 1, 27, 22, 6, 1, 260, 6, 40, 5, 11, 3, 100, 13, 78, 27, 6, 3, 874, 3, 4, 22, 48, 5, 52, 7, 27, 29, 116, 3, 1319, 3, 8, 36, 23, 13, 116, 3, 444, 112, 4, 1, 1834
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OFFSET

1,6


LINKS

T. D. Noe, Table of n, a(n) for n=1..300


EXAMPLE

Fibonacci(9) = 34; and the divisors of 34 are 1, 2, 17 and 34. Of these divisors, 1 and 2 divide earlier Fibonacci numbers, 17 and 34 do not. So a(9) = 2.


MATHEMATICA

f[t_] := Append[t, Select[Divisors[Fibonacci[Length[t] + 1]], FreeQ[Flatten[t], # ] &]]; Length /@ Nest[f, {}, 85] (*Chandler*)


CROSSREFS

Cf. A120255, A001177.
Sequence in context: A011776 A098965 A016443 * A114811 A219025 A270746
Adjacent sequences: A120253 A120254 A120255 * A120257 A120258 A120259


KEYWORD

nonn


AUTHOR

Leroy Quet, Jun 13 2006


EXTENSIONS

Extended by Ray Chandler, Jun 14 2006


STATUS

approved



