In Mathematics
- Although composite, 145 is a pseudoprime.
- Given 145, the Mertens function returns 0.
- 145 is a pentagonal number and a centered square number.
- . 145 is the fourth number that is the sum of two different pairs of squares. Also, 145 is the result of 34 + 43, making it a Leyland number.
- , making it a factorion. The only other numbers that have the property that they are the sum of the factorials of their digits are 1, 2 and 40585.
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“... though mathematics may teach a man how to build a bridge, it is what the Scotch Universities call the humanities, that teach him to be civil and sweet-tempered.”
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