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Neurobics

Commonalities Revisited

Here are the answers to the October Neurobics puzzle.

(1) Each letter has a "vertical" line of symmetry. (2) They are all prime numbers. (3) They are all square numbers. (4) They all divide the plane into two or more regions (the letters have "'holes"). ( (5) They all have eight divisors. (6) They are all drawn using three line segments. (7) Their digits all sum to 23. (8) They are the first 20 successive decimal digits of pi. (9) They are all used in Roman numerals. (10) They are all divisible by nine.

Russell Dear is a Mathematician living in Invercargill