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  2. Pandigital, Inc. - Wikipedia

    en.wikipedia.org/wiki/Pandigital,_Inc.

    Pandigital, Inc., was a digital photo-frame manufacturer founded in 1998 that around 2010 began to expand its product line to include e-reader, tablets and e-books. Its tablet products included the Planet, Novel, Star, Nova, and SuperNova, and an offline Wikipedia reader called WikiReader .

  3. Wikipedia:Evaluating how interesting an integer's ...

    en.wikipedia.org/wiki/Wikipedia:Evaluating_how...

    Harry wants to create an article on the pandigital number 1023458967. The only property of the number that he knows about is that it's a pandigital number. 1023458967 is a pandigital number. Start with 10 7 points. Harry finds an entry on pandigital numbers in Eric W. Weisstein's CRC Concise Encyclopedia of Mathematics. He ignores the fact that ...

  4. Pandigital number - Wikipedia

    en.wikipedia.org/wiki/Pandigital_number

    The largest pandigital number without redundant digits to be also a square number is 9814072356 = 99066 2. Two of the zeroless pandigital Friedman numbers are: 123456789 = ((86 + 2 × 7) 5 − 91) / 3 4, and 987654321 = (8 × (97 + 6/2) 5 + 1) / 3 4. A pandigital Friedman number without redundant digits is the square: 2170348569 = 46587 2 + (0 ...

  5. WikiReader - Wikipedia

    en.wikipedia.org/wiki/WikiReader

    The project was sponsored by Openmoko and made by Pandigital, and its source code has been released. [2] The project debuted an offline portable reader for Wikipedia in October 2009. [1] Updates in multiple languages were available online [3] and a twice-yearly offline update service delivered via Micro SD card was also available at a cost of ...

  6. Polydivisible number - Wikipedia

    en.wikipedia.org/wiki/Polydivisible_number

    A common, trivial extension of the aforementioned example is to arrange the digits 0 to 9 to make a 10 digit number in the same way, the result is 3816547290. This is a pandigital polydivisible number.

  7. Stirling numbers of the second kind - Wikipedia

    en.wikipedia.org/wiki/Stirling_numbers_of_the...

    The Stirling numbers of the second kind, written (,) or {} or with other notations, count the number of ways to partition a set of labelled objects into nonempty unlabelled subsets.

  8. Divergence of the sum of the reciprocals of the primes

    en.wikipedia.org/wiki/Divergence_of_the_sum_of...

    The sum of the reciprocal of the primes increasing without bound. The x axis is in log scale, showing that the divergence is very slow. The red function is a lower bound that also diverges.

  9. Centered pentagonal number - Wikipedia

    en.wikipedia.org/wiki/Centered_pentagonal_number

    In mathematics, a centered pentagonal number is a centered figurate number that represents a pentagon with a dot in the center and all other dots surrounding the center in successive pentagonal layers.