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A046515 Numbers with multiplicative persistence value 6. 3
6788, 6878, 6887, 7688, 7868, 7886, 8678, 8687, 8768, 8786, 8867, 8876, 16788, 16878, 16887, 17688, 17868, 17886, 18678, 18687, 18768, 18786, 18867, 18876, 23788, 23878, 23887, 24678, 24687, 24768, 24786, 24867, 24876, 26478, 26487 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

Eric Weisstein's World of Mathematics, Multiplicative Persistence

EXAMPLE

6788 -> [ 2688 ][ 768 ][ 336 ][ 54 ][ 20 ][ 0 ] -> one digit in six 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=6, [$1..30000]); # Robert Israel, Feb 12 2019

CROSSREFS

Cf. A003001, A014120, A046506.

Sequence in context: A200436 A250332 A121106 * A199996 A266847 A132215

Adjacent sequences:  A046512 A046513 A046514 * A046516 A046517 A046518

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 November 17 13:30 EST 2019. Contains 329230 sequences. (Running on oeis4.)