1A
1
2
4
5
6
9
10
12
13
14
17
18
20
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22
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24
Orizzontali
- 1A
- 4A
- 7A
- 8A
- 9A
- 12A
- 15A
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- 17A
- 20A
- 23A
- 24A
Verticali
- 1DNumber of equilateral triangles that are formed by the sides and diagonals of a regular six-sided hexagon.
- 2DThe highest number for which prime numbers are one-third the integers from 0 to it.
- 3DMagic constant for a 5x5 magic square of 1 to 25.
- 4DThe smallest positive even number such that neither one more nor one less is prime.
- 5DThe smallest number xy (where x and y are digits) such that y^x - x^y is larger than
. - 6DThe largest number n such that k^2-k+n generates prime numbers for all positive integers less than n. The largest of Euler’s lucky numbers
- 9DThe number of ways to partition a set of five elements.
- 10DMaximum number of pieces a pancake can be cut into using nine strait cuts. Lazy Caterer’s number
- 11DFewest dots that can be used to form a solid Star of David., aka a Centered Star
- 12DFirst Fibonacci number with consecutive increasing digits.
- 13DIf you start a Fibonacci sequence with its digits, you will regenerate itself in six steps. (e.g. 14 regenerates itself in 3 steps)
- 14DA square number that when squared keeps itself as the final two digits.
- 17DFewest number of dots needed to arrange them in either a square or an equilateral triangle (excluding 0 and 1).
- 18DAlien Area
(one non-math clue for my ancestors) - 19DAlternating digits in binary and the sum of the initial ¿ even numbers. (I think these two properties must be related somehow)
- 20DNumber of ways you can pair up six people.
- 21DNumber of unique orderings four people can finish in a race, disallowing ties.
- 22DConsider a 3x3 grid of squares with their NE-SW diagonals drawn. This is the number of ways to move from the NE corner to the SW corner, each time moving south, west, or southwest. spoiler
