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A199993 Composite numbers whose multiplicative persistence is 3. 0
39, 49, 55, 57, 66, 68, 69, 74, 75, 78, 86, 87, 88, 93, 94, 95, 96, 98, 147, 155, 159, 166, 168, 169, 174, 175, 178, 186, 187, 188, 189, 194, 195, 196, 198, 236, 238, 246, 247, 248, 249, 264, 266, 267, 272, 274, 276, 279, 284, 288, 289, 292, 294, 297, 298, 299 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Complement of A046503 with respect to A046512.

LINKS

Table of n, a(n) for n=1..56.

Eric Weisstein's World of Mathematics, Multiplicative Persistence

FORMULA

{ A046512 } minus { A046503 }.

EXAMPLE

147 -> 1 * 4 * 7 -> [ 28 ] -> 2 * 8 -> [ 16 ] -> 1 * 6 -> [ 6 ] -> one digit in three steps.

CROSSREFS

Cf. A046503 (primes whose multiplicative persistence is 3).

Sequence in context: A064399 A235151 A050439 * A181488 A020305 A216978

Adjacent sequences:  A199990 A199991 A199992 * A199994 A199995 A199996

KEYWORD

nonn,base

AUTHOR

Jaroslav Krizek, Nov 13 2011

STATUS

approved

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Last modified October 16 09:29 EDT 2019. Contains 328056 sequences. (Running on oeis4.)