Fifty Six (56)
1. It is a tetrahedral number. It is the sum of first six triangular numbers.
1 + 3 + 6 + 10 + 15 + 21 = 56
2. It is an abundant number.
3. It is a tetranacci number. Like Fibonacci sequence, in the tetranacci numbers the next number is the sum of previous four terms. The first few tetranacci numbers are---
0, 0, 0, 1, 1, 2, 4, 8, 15, 29, 56, 108, 208, 401, 773—
4. It is the maximum number of regions into which 10 lines can divide a plane.
5. Here is an interesting puzzle involving 56.
111 + 1 / 1 + 1 = 56 222 + 2 / 2 + 2 = 56
333 + 3 / 3 + 3 = 56 444 + 4 / 4 + 4 = 56
6. The atomic number of Barium is 56.
7. The number of reduced 5 x 5 Latin square is 56. Here is an example---
1 2 3 4 5 2 3 5 1 4 3 5 4 2 1 4 1 2 5 3 5 4 1 3 2
Dr Rajesh Kumar Thakur
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