The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A046516 Numbers with multiplicative persistence value 7. 5
 68889, 68898, 68988, 69888, 86889, 86898, 86988, 88689, 88698, 88869, 88896, 88968, 88986, 89688, 89868, 89886, 96888, 98688, 98868, 98886, 168889, 168898, 168988, 169888, 186889, 186898, 186988, 188689, 188698, 188869, 188896, 188968 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS From Daniel Mondot, Mar 26 2022: (Start) The product of the digits of each term is 27648, 47628, 64827, 84672, 134217728, 914838624, 1792336896, 3699376128, 48814981614, 134481277728, 147483721728 or 1438916737499136 (sequence A350185). The first 62 terms produce 27648. The first term that produces 47628 is a(63). The first term that produces 64827 is a(233). The first term that produces 84672 is a(235). The first term that produces 134217728 is a(1753110). The first term that produces 914838624 is a(17835449). The first term that produces 1792336896 is a(18235677). The first term that produces 3699376128 is a(23853261). The first term that produces 48814981614 is a(66441891). The first term that produces 134481277728 is a(452601087). The first term that produces 147483721728 is a(425636434). The first term that produces 1438916737499136 is somewhere after a(500*10^6). (End) LINKS Robert Israel, Table of n, a(n) for n = 1..10000 Daniel Mondot, Multiplicative Persistence Tree Eric Weisstein's World of Mathematics, Multiplicative Persistence EXAMPLE 68889 -> [ 27648 ][ 2688 ][ 768 ][ 336 ][ 54 ][ 20 ][ 0 ] -> one digit in seven 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=7, [\$1..200000]); # Robert Israel, Feb 12 2019 CROSSREFS Cf. A003001, A014120, A046507, A350185. Sequence in context: A213702 A233721 A121107 * A199997 A250500 A354194 Adjacent sequences: A046513 A046514 A046515 * A046517 A046518 A046519 KEYWORD nonn,base AUTHOR Patrick De Geest, Sep 15 1998 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified April 12 06:13 EDT 2024. Contains 371623 sequences. (Running on oeis4.)