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A240810 a(n) = index of first nonexisting term of the meta-Fibonacci sequence {f(1) = ... = f(n) = 1; f(k)=f(k-f(k-1))+f(k-f(k-n))} if that sequence is only defined for finitely many terms, or 0 if that sequence is infinite. 3
7, 0, 165, 0, 61, 2355, 283, 1337, 101, 1255, 367, 420, 499, 484, 779, 1205, 293, 374, 846, 839, 1119, 2121, 816, 2617, 687, 1196, 746, 1113, 2133, 1589, 755, 1228, 1280, 1662, 717, 2276, 785, 2342, 1875, 1464, 1123, 2801, 1351, 1614, 2280, 1558, 1533 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(2)=0 is only a conjecture (see A005185), whereas a(4)=0 is a theorem of Balamohan et al. (2007).

Except for the two zero entries, this is equal to A134680(n)+1. See that entry for further information.

LINKS

Table of n, a(n) for n=1..47.

B. Balamohan, A. Kuznetsov and S. Tanny, On the behavior of a variant of Hofstadter's Q-sequence, J. Integer Sequences, Vol. 10 (2007), #07.7.1.

D. R. Hofstadter, Curious patterns and non-patterns in a family of meta-Fibonacci recursions, Lecture in Doron Zeilberger's Experimental Mathematics Seminar, Rutgers University, April 10 2014; Part 1, Part 2.

Index entries for Hofstadter-type sequences

CROSSREFS

See A134680 for another version.

A diagonal of the triangle in A240816.

Sequence in context: A167317 A266436 A240822 * A024094 A157307 A036949

Adjacent sequences:  A240807 A240808 A240809 * A240811 A240812 A240813

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 15 2014

STATUS

approved

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Last modified May 6 08:24 EDT 2021. Contains 343580 sequences. (Running on oeis4.)