Aardvark Number Sequences - Answers

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1)   13 - The number of moons for each planet starting with Mercury.

2)   23, 31 - Every other prime number.

3)  -241, -727 - The pattern is n*3-4.

4)  21, 34, 55 - Fibonacci's sequence. Add any two consecutive numbers in the sequence to get the next number (1+1=2, 1+2=3, 2+3=5 etc.). 

5)  2, 256, 65536 - Each number in the sequence is the square of the previous number.

6)  140 - The pattern is n*8+4.

7)  60 - The pattern is n*5.

8)  1 - The pattern is n-15.

9)  71314 - The pattern is based on the numerical value of the letters (=1, b=2, c=3 etc.) in the name "ENIGMADNESS" beginning with the first four letters and then shifting along the word in one letter increments (ENIG, NIGM, IGMA, GMAD etc.) 

10) 28, 24, 18 - The pattern is 10*1, 9*2, 8*3 etc.

11) 98, 104, 108 - Similar to #10, the pattern is 20*1, 19*2, 18*3 etc.

12) 4598, 7843, 2376 ? 5621 - Reverse each number then -1 from each digit to get the next number in the sequence.

13) 144 - The pattern is n/12.

14) 27, 61, 72 - The pattern is n+1 for each digit.

15) 8, I, 1010, XI - The pattern is simply 0, 1, 2, 3, 4, etc. but presented in four formats: numerical, alphabetical, binarial and Roman numeric.