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A038528
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If n has decimal expansion abc...d, with k digits, let f(n) be obtained by deleting all k's from abc...d, closing up and deleting initial 0's; sequence gives n such that f(f(f(...(n)))) = 0 or empty.
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1
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1, 12, 20, 21, 22, 123, 132, 133, 203, 213, 223, 230, 231, 232, 300, 301, 303, 312, 313, 320, 321, 322, 330, 331, 333, 1234, 1243, 1244, 1324, 1334, 1342, 1343, 1423, 1424, 1432, 1433, 1442, 1444, 2034, 2043, 2044, 2134, 2143, 2144, 2234
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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EXAMPLE
| If n=22 (2 digits), f(n) = empty. If n=230 (3 digits), f(n)=20, f(f(n))=0. If n=301 (3 digits), f(n)=1 (1 digit), f(f(n))=empty.
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CROSSREFS
| Cf. A038527.
Sequence in context: A046418 A171795 A170806 * A052020 A075078 A050421
Adjacent sequences: A038525 A038526 A038527 * A038529 A038530 A038531
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KEYWORD
| easy,fini,nonn,base,nice
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AUTHOR
| Naohiro Nomoto (6284968128(AT)geocities.co.jp)
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