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A054351
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Successive generations of the Kolakoski sequence A000002.
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11
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1, 12, 1221, 1221121, 12211212212, 122112122122112112, 1221121221221121122121121221, 1221121221221121122121121221121121221221121, 12211212212211211221211212211211212212211212212112112212211212212
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,2
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LINKS
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PROG
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(Python)
from itertools import accumulate, groupby, repeat
def K(n, _):
c, s = "12", ""
for i, k in enumerate(str(n)): s += c[i%2]*int(k)
return int(s + c[(i+1)%2])
def aupton(nn): return list(accumulate(repeat(1, nn+1), K))
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 05 2003
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STATUS
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approved
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