Counting with pictures
- Drale
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615 = 3 x 5 x 41. It is the product of three distinct Sophie Germain primes.
615 is a hypotenuse for which there exist four distinct integer triangles.
615 is the sum of seven positive fifth powers: 615 = 3^5 + 3^5 + 2^5 + 2^5 + 2^5+ 2^5 + 1^5.
The sum of the even digits of 615 equals the sum of the odd digits of 615. -
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