3!=6
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if repeating is allowed... 36 (6x6, for the last two digits) If not, 6 (3x2, last two digits)
312 is a single, 3-digit number. It is not a sequence.
3591733 is a 7-digit number. A single number cannot define a sequence.
The first four-digit Fibonacci number is 1597 - equal to 610 + 987.
The following is one of [10 quadrillion] 16 digit sequence.6352719155731945