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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A046508 Primes with multiplicative persistence value 8. 3
 2678789, 2687879, 2687897, 2688797, 2688977, 2689877, 2697887, 2768789, 2768897, 2769887, 2778689, 2786789, 2787689, 2788769, 2798687, 2798867, 2868779, 2868977, 2876789, 2876879, 2878679, 2878697, 2878769, 2879687 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Daniel Mondot, Table of n, a(n) for n = 1..10000 (terms 1..9001 from Harvey P. Dale) Eric Weisstein's World of Mathematics, Multiplicative Persistence EXAMPLE 2678789 -> [ 338688 ][ 27648 ][ 2688 ][ 768 ][ 336 ][ 54 ][ 20 ][ 0 ] -> one digit in eight steps. MATHEMATICA mp8Q[n_]:=Length[NestWhileList[Times@@IntegerDigits[#]&, n, #>9&]]==9; Select[ Prime[ Range[210000]], mp8Q] (* Harvey P. Dale, Mar 30 2019 *) CROSSREFS Intersection of A000040 and A046517. Cf. A046500. Sequence in context: A121108 A046517 A199998 * A251457 A178291 A212231 Adjacent sequences:  A046505 A046506 A046507 * A046509 A046510 A046511 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 August 16 18:56 EDT 2022. Contains 356169 sequences. (Running on oeis4.)