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 A121347 Largest number whose factorial is less than (n!)^2. 4
 2, 4, 5, 7, 9, 10, 12, 14, 15, 17, 19, 20, 22, 24, 26, 27, 29, 31, 32, 34, 36, 38, 39, 41, 43, 44, 46, 48, 50, 51, 53, 55, 57, 58, 60, 62, 64, 65, 67, 69, 71, 72, 74, 76, 78, 79, 81, 83, 85, 87, 88, 90, 92, 94, 95, 97, 99, 101, 102, 104, 106, 108, 110, 111, 113, 115, 117, 118 (list; graph; refs; listen; history; text; internal format)
 OFFSET 2,1 LINKS Chai Wah Wu, Table of n, a(n) for n = 2..10000 EXAMPLE a(3)=4 because 4!=24 is the largest factorial not exceeding (3!)^2=36. MATHEMATICA s={2}; f1=4; f2=2; k=2; Do[f1=f1*n^2; While[f2

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Last modified August 3 10:43 EDT 2021. Contains 346435 sequences. (Running on oeis4.)