Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

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to yield nines (problem 17?). Use multiples of 23. The clue is that the number is 21 digits long. It would have been more obvious if it had been 22 digits long. eg 1304347826086956521739

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