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A046514 Numbers with multiplicative persistence value 5. 5
679, 688, 697, 769, 796, 868, 886, 967, 976, 1679, 1688, 1697, 1769, 1796, 1868, 1886, 1967, 1976, 2379, 2388, 2397, 2468, 2486, 2648, 2684, 2688, 2739, 2777, 2793, 2838, 2846, 2864, 2868, 2883, 2886, 2937, 2973, 3279, 3288, 3297, 3367, 3376, 3448 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Eric Weisstein's World of Mathematics, Multiplicative Persistence
EXAMPLE
2777 -> [ 686 ][ 288 ][ 128 ][ 16 ][ 6 ] -> one digit in five steps.
MAPLE
mp:= proc(n) option remember;
if n <= 9 then return 0 fi;
1+procname(convert(convert(n, base, 10), `*`))
end proc:
select(mp=5, [$1..4000]); # Robert Israel, Feb 12 2019
CROSSREFS
Sequence in context: A186127 A097771 A121105 * A199995 A352263 A340091
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Sep 15 1998
EXTENSIONS
Offset corrected by Robert Israel, Feb 12 2019
STATUS
approved

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)