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.

http://hades.ph.tn.tudelft.nl/Internal/PHServices/Documentation/MathWorld/math/math/m/m443.htm

Multiplicative Persistence

http://hades.ph.tn.tudelft.nl/Internal/PHServices/Documentation/MathWorld/math/math/a/a057.htm

Additive Persistence

http://hades.ph.tn.tudelft.nl/Internal/PHServices/Documentation/MathWorld/math/math/d/d204.htm

Digital Root

http://hades.ph.tn.tudelft.nl/Internal/PHServices/Documentation/MathWorld/math/math/m/m439.htm

Multiplicative Digital Root

http://www.wschnei.de/digit-related-numbers/persistence.html

Persistence of a number

http://www.primepuzzles.net/puzzles/puzz_022.htm

Minimal prime with persistence p

http://www.inwap.com/pdp10/hbaker/hakmem/number.html#item56

Amount of numbers with persisitence p

http://www.math.niu.edu/~rusin/known-math/97/digiprod

little contribution

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

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