FORBIDDEN NUMBER
6 / 21
The Monster Group Order
808,017,424,794,512,875,886,459,904,961,710,757,005,754,368,000,000,000
WHY IT IS FORBIDDEN
Not forbidden, but monstrous: the order of the largest sporadic simple group. Its existence was conjectured before it could be constructed; it lives in 196,883 dimensions.
Predicted by Fischer and Griess, constructed by Griess in 1982. Connected to modular forms via Monstrous Moonshine (Conway, Norton, Borcherds).
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