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A kilowatthour of electricity can provide 3413 BTU's of heat. [Bobick] 3413 = 1^{1} + 2^{2} + 3^{3} + 4^{4} + 5^{5}. [Patterson] The sum of the product of all odd digits (1*3*5*7*9) and the positive even digits concatenated in increasing order (2468). [Silva] 3413 is the 13th prime number ending in 13. [Noe] The smallest prime formed by concatenating P, S, n, where P is the product and S the sum of the digits of a zeroless multidigit integer n, i.e., n=13. Shall we call it a PSn prime? [Loungrides]
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