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After 1 and 9, 225 is the third smallest number n for which σ(φ(n)) = φ(σ(n)), where σ is the sum of divisors function and φ is Euler's totient function. [8] 225 is a refactorable number. [9] 225 is the smallest square number to have one of every digit in some number base (225 is 3201 in base 4) [10] 225 is the first odd number with ...
Since 36 is also triangular, 666 is a doubly triangular number. [5] Also, 36 = 15 + 21 where 15 and 21 are triangular as well, whose squares ( 15 2 = 225 and 21 2 = 441 ) add to 666 and have a difference of 216 = 6 × 6 × 6 .
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5244 = 22 2 + 23 2 + … + 29 2 = 20 2 + 21 2 + … + 28 2; 5249 – highly cototient number [9] 5253 – triangular number; 5279 – Sophie Germain prime, twin prime with 5281, 700th prime number; 5280 is the number of feet in a mile. [10] It is divisible by three, yielding 1760 yards per mile and by 16.5, yielding 320 rods per mile.
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2. Between two groups, may mean that the first one is a subgroup of the second one. ≥ 1. Means "greater than or equal to". That is, whatever A and B are, A ≥ B is equivalent to A > B or A = B. 2. Between two groups, may mean that the second one is a subgroup of the first one. 1.