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A087830 Consecutive repeats in A087831, the triple recursion skip two Hofstadter Q of the second sort. 0
1, 2, 3, 4, 5, 7, 10, 14, 15, 19, 20, 26, 27, 30, 31, 33, 34, 37, 41, 44, 47, 55, 62, 64, 66, 70, 74, 75, 84, 86, 87, 90, 93, 94, 96, 101, 111, 112, 116, 119, 122, 123, 129, 130, 140, 142, 145, 148, 157, 158, 163, 166, 172, 174, 178, 179, 181, 193, 199, 203, 224, 225 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..61.

MATHEMATICA

Hofstadter14[n_Integer?Positive] := Hofstadter14[n] = Hofstadter14[Abs[n - Hofstadter14[n-1]]] + Hofstadter14[ Hofstadter14[Abs[n - Hofstadter14[n-4]]]] Hofstadter14[0] = Hofstadter14[1] = Hofstadter14[2]= Hofstadter14[3]= Hofstadter14[4]= 1 digits=3000 ta=Table[Hofstadter14[n], {n, 1, digits}]; b=Table[If[ta[[n]]-ta[[n-1]]==0, ta[[n]], 0], {n, 2, digits}]; c=Delete[Union[b], 1]

CROSSREFS

Cf. A005206.

Sequence in context: A017835 A007601 A195944 * A039857 A255216 A017836

Adjacent sequences:  A087827 A087828 A087829 * A087831 A087832 A087833

KEYWORD

nonn

AUTHOR

Roger L. Bagula, Oct 06 2003

STATUS

approved

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Last modified July 10 12:53 EDT 2020. Contains 335576 sequences. (Running on oeis4.)