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A046505 Primes with multiplicative persistence value 5. 3
769, 967, 1697, 2777, 3637, 3673, 4483, 6197, 6337, 6373, 6719, 6733, 6779, 6791, 6917, 6971, 6977, 7559, 7691, 7727, 8443, 8681, 8861, 9677, 9767, 12379, 12739, 12973, 13297, 13367, 13729, 13763, 14779, 14797, 14843, 17239, 17293, 17497 (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..1000 from Harvey P. Dale)
Eric Weisstein's World of Mathematics, Multiplicative Persistence
EXAMPLE
769 -> [ 378 ][ 168 ][ 48 ][ 32 ][ 6 ] -> one digit in five steps.
MATHEMATICA
mp5Q[n_]:=Length[NestWhileList[Times@@IntegerDigits[#]&, n, #>9&]]==6; Select[ Prime[Range[2100]], mp5Q] (* Harvey P. Dale, Dec 30 2019 *)
CROSSREFS
Intersection of A000040 and A046514.
Cf. A046500.
Sequence in context: A290271 A206711 A308789 * A229854 A217495 A216646
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Sep 15 1998
STATUS
approved

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Last modified March 28 07:32 EDT 2024. Contains 371235 sequences. (Running on oeis4.)