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727 (another Prime Pages' Curiosity) |
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will be down at times on those day (and possibly the next). (caldwell@utm.edu) The Boeing 727 became the first three-engine jet built for commercial service. 727 = 1! + (1 + 2)! + (1 + 2 + 3)!. [van Doorn] The smallest odd prime that can be represented as the sum of a cube and its reverse (512 + 215). [Gupta] The first prime whose square (528529) can be represented as the concatenation of two consecutive numbers. [De Geest]
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