http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=014553
Maximal multiplicative persistence (or length) of any n-digit number.
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=031346
Multiplicative persistence: number of iterations of "multiply digits" needed to reach 0 or 1.
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=A006050
Smallest number of additive persistence n
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=A007954
Product of digits of n
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=A046511
Numbers with multiplicative persistence value 2.
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=A014120
Smallest number of persistence n over product-of-nonzero-digits function.
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=A046502
Primes with multiplicative persistence value 2.
Multiplicative Persistence
Digital Root
Multiplicative Digital Root
http://www.wschnei.de/digit-related-numbers/persistence.html
Persistence of a number
http://www.primepuzzles.net/puzzles/puzz_022.htm
Minimale Primzahl mit Persistence p
http://www.inwap.com/pdp10/hbaker/hakmem/number.html#item56
Anzahl der Zahlen mit Persisitence p
http://www.math.niu.edu/~rusin/known-math/97/digiprod
kleiner Beitrag
http://home.iae.nl/users/mhx/monsterbench.html
Benchmark
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=064867
The minimal number which has multiplicative persistence 3 in base n
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=064868
The minimal number which has multiplicative persistence 4 in base n
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=064869
The minimal number which has multiplicative persistence 5 in base n
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=064870
The minimal number which has multiplicative persistence 6 in base n
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=064871
The minimal number which has multiplicative persistence 7 in base n
http://www.research.att.com/cgi-bin/access.cgi/as/njas/sequences/eisA.cgi?Anum=064872
The minimal number which has multiplicative persistence 8 in base n