Cody

William

2
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71
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51 – 100 of 3,682

William liked Problem 45272. Pseudo-vampire number

on 2 Feb 2020 at 18:50

William submitted Solution 2113929 to Problem 45298. How many ways?

on 2 Feb 2020 at 3:14

William submitted Solution 2113872 to Problem 45304. MinMax

on 1 Feb 2020 at 23:25

William submitted Solution 2113864 to Problem 45303. Combinatorics - 01

on 1 Feb 2020 at 23:04

William submitted Solution 2113863 to Problem 45303. Combinatorics - 01

on 1 Feb 2020 at 22:58

William submitted a Comment to Problem 45302. Ugly numbers - 03

Unlike the previous two "ugly()" problems, in this one it appears that the number "1" is not considered ugly.

on 1 Feb 2020 at 17:32

William submitted Solution 2113563 to Problem 45302. Ugly numbers - 03

on 1 Feb 2020 at 17:25

William submitted Solution 2113557 to Problem 45302. Ugly numbers - 03

on 1 Feb 2020 at 17:25

William submitted Solution 2113518 to Problem 45297. Ugly numbers - 02

on 1 Feb 2020 at 16:53

William submitted Solution 2113463 to Problem 45296. Ugly numbers - 01

on 1 Feb 2020 at 15:57

William submitted Solution 2113458 to Problem 45296. Ugly numbers - 01

on 1 Feb 2020 at 15:55

William submitted Solution 2113448 to Problem 45296. Ugly numbers - 01

on 1 Feb 2020 at 15:50

William submitted Solution 2108728 to Problem 45280. La derivada numérica

on 28 Jan 2020 at 16:29

William submitted a Comment to Problem 45275. Solve Sudoku puzzle step by

Hello BinBin, This is a good problem! But I am wondering: In the test suite, shouldn't the statement "tt = mat2cell(s,[3,3,3],[3,3,3]);" be inside the for-loop?

on 25 Jan 2020

William submitted Solution 2094947 to Problem 45267. Zero

on 16 Jan 2020

William submitted Solution 2091821 to Problem 45250. Be happy

on 13 Jan 2020

William submitted a Comment to Problem 45250. Be happy

Asif, Yes, I looked at the information on non-trivial perfect digital invariants. Near the end of that reference, there is a short section entitled "Relation to happy numbers" that indicates that in order for a number to be happy, it needs to be a perfect digital invariant with the value of 1. In this case, the invariant is 8 (or 22 in base-3), so I interprete that as saying that it is a non-trivial PDI, but not happy.

on 10 Jan 2020

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