197
This number is a prime.
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If A=1, B=2, C=3, … , Z=26 then 'A PRIME QUADRUPLET' is one of four primes in a prime quadruplet. [Homewood]
19 x 7 + (1 x 9 x 7) + 1 = 197. [Homewood]
(There is one curio for this number that has not yet been approved by an editor.)
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