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2. Math Blaster Episode I: In Search of Spot - Wikipedia

   en.wikipedia.org/wiki/Math_Blaster_Episode_I:_In...

   Number patterns - instead of featuring traditional equations, "number patterns" provides the user with a series of numbers with one of the numbers missing. The user must identify the pattern to find the missing number (for example, if the problem presented is "5, 10, 15, _, 25", then the missing number is 20).

3. Four fours - Wikipedia

   en.wikipedia.org/wiki/Four_fours

   For example, when d=4, the hash table for two occurrences of d would contain the key-value pair 8 and 4+4, and the one for three occurrences, the key-value pair 2 and (4+4)/4 (strings shown in bold). The task is then reduced to recursively computing these hash tables for increasing n , starting from n=1 and continuing up to e.g. n=4.

4. Math Rabbit - Wikipedia

   en.wikipedia.org/wiki/Math_Rabbit

   The game takes place in a circus and teaches addition, subtraction, and counting in four different games, each of which with multiple difficulty settings. [1] [2] The game is for ages 4–8. [3] The four games are: Clown's Counting Games - the player is required to count with a number as a guide to pitch the tone of the musical instrument.

5. Look-and-say sequence - Wikipedia

   en.wikipedia.org/wiki/Look-and-say_sequence

   This version of the pea pattern eventually forms a cycle with the two "atomic" terms 23322114 and 32232114. Other versions of the pea pattern are also possible; for example, instead of reading the digits as they first appear, one could read them in ascending order instead (sequence A005151 in the OEIS). In this case, the term following 21 would ...

6. List of integer sequences - Wikipedia

   en.wikipedia.org/wiki/List_of_integer_sequences

   1, 1, 2, 2, 4, 2, 6, 4, 6, 4, ... φ(n) is the number of positive integers not greater than n that are coprime with n. A000010: Lucas numbers L(n) 2, 1, 3, 4, 7, 11, 18, 29, 47, 76, ... L(n) = L(n − 1) + L(n − 2) for n ≥ 2, with L(0) = 2 and L(1) = 1. A000032: Prime numbers p n: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, ... The prime numbers p ...

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