Test whether 123^321 is greater than 456^123.

28.1

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Get a list of numbers up to 100 whose digits add up to less than 5.

28.2

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Make a list of the first 20 integers, with prime numbers styled red.

28.3

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Find words in WordList[ ] that both begin and end with the letter “p”.

28.4

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Make a list of the first 100 primes, keeping only ones whose last digit is less than 3.

28.5

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Find Roman numerals up to 100 that do not contain “I”.

28.6

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Get a list of Roman numerals up to 1000 that are palindromes.

28.7

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Find names of integers up to 100 that begin and end with the same letter.

28.8

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Get a list of words longer than 15 characters from the Wikipedia article on words.

28.9

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Starting from 1000, divide by 2 if the number is even, and compute 3#+1& if the number is odd; do this repeatedly 200 times (Collatz problem).

28.10

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Make a word cloud of 5-letter words in the Wikipedia article on computers.

28.11

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Find words in WordList[ ] whose first 3 letters are the same as their last 3 read backward, but where the whole string is not a palindrome.

28.12

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Find all 10-letter words in WordList[ ] for which the total of LetterNumber values is 100.

28.13

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Make a table of integers up to 25 where every integer ending in 3 is replaced with 0.

x28.1

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Use Table and If to make a 5×5 array that is 1 on its leading diagonal, and 0 otherwise.

x28.2

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Get a list of numbers up to 1000 that are equal to 1 mod both 7 and 8.

x28.3

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Make a list of numbers up to 100, where multiples of 3 are replaced by Black, multiples of 5 by White and multiples of 3 and 5 by Red.

x28.4

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Use Select to get a list of planets whose mass is larger than Earth.

x28.5

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Make a 50×50 array plot in which a square at position i,j is black if Mod[i,j]==0.

x28.6

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Make a 100×100 array plot in which a square is black if the values of both its x and y positions do not contain a 5.

x28.7

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