16723...99999 (200-digits)
This number is a prime.
1672375728 3622817643 9702951352 2593146688 1865832845 0745257391
7838075408 3893112407 4734171854 1317996245 3270394094 7330352263 8133602147
3520304649 7462027859 7412501491 2401303142 3999999999 9999999999 9999999999
Frank Morgan's "Math Chat" column (1997) challenged readers to find the largest prime number by using four 4's and a finite number of mathematical symbols and operators in common use. William Foster had the best submission: ((sqrt(4)/.4)!! - .4)/.4. [Brahinsky]
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