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A198377 Smallest nonprime number with multiplicative persistence n. 0
0, 10, 25, 39, 77, 679, 6788, 68889, 2677889, 26888999, 3778889989, 277777788888899 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Probably finite sequence. The multiplicative persistence of a number is the number of times you need to multiply the digits together before reaching a single digit.

LINKS

Table of n, a(n) for n=0..11.

EXAMPLE

For n=4, a(4) = 39 because 39 is the smallest nonprime number with multiplicative persistence 3: 39 -> 27 -> 14 -> 4.

CROSSREFS

Cf. A046500 (smallest prime with multiplicative persistence n).

Sequence in context: A087473 A014120 A003001 * A038350 A003344 A047721

Adjacent sequences:  A198374 A198375 A198376 * A198378 A198379 A198380

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Oct 23 2011

STATUS

approved

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Last modified May 26 21:54 EDT 2018. Contains 304645 sequences. (Running on oeis4.)