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77! + 1 is prime! 77 contains 'Lucky 7 and 11' as prime factors. [Sladcik] The square of 77 is 5929, the concatenation of two primes, 59 and 29. [Trotter] The concatenation of all palindromes from one up to 77 is prime. [De Geest] The number 7^7+77^7+777^7+2 is prime with digital sum 77. [Patterson] 77 is equal to the sum of the first 8 primes. Note it is also the product of the middle two numbers of this sequence (11*7 = 77). [Kazgan]
(There is one curio for this number that has not yet been approved by an editor.)
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