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More Consecutive Semiprimes (Posted on 2009-09-08) Difficulty: 3 of 5
Consider the series of semiprimes. Now consider the series of numbers representing the Sum Of Digits (SOD) of each semiprime.

(1.) How many times does the number '9' occur, and why?

(2.) What is the smallest semiprime that has the same SOD as the next consecutive semiprime? or prove that there is no pair of consecutive semiprimes that have the same SOD.

No Solution Yet Submitted by Larry    
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  Subject Author Date
re: part 2 (computer solution) UBASIC versionCharlie2009-09-08 23:58:21
part 2 (computer solution)Daniel2009-09-08 12:57:22
part 1 with proofDaniel2009-09-08 12:50:03
SolutionAnswer to part 1FrankM2009-09-08 12:48:24
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