Wednesday, 11 September 2013

"Raaargh!" says ANN7 and CoJ – Let's Talk Geek 138

Audio download and video recording

In Episode 138


Johan Els


138 is a sphenic number, the sum of four consecutive primes (29 + 31 + 37 + 41), and the smallest product of 3 primes, such that in base 10, the third prime is a concatenation of the other two: .

In number theory, a sphenic number (from Ancient Greek: σφήνα, 'wedge') is a positive integer that is the product of three distinct prime numbers.


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  • Geekfest (31 August): Goldfields Kennel Club, Boeing Street, Bedfordview
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