Archive for May, 2011



  Fifteen is a triangular number, a hexagonal number, a pentatope number and the 4th Bell number. Fifteen is the double factorial of 5. It is a composite number; its proper divisors being 1, 3 and 5. With only two exceptions, all prime quadruplets enclose a multiple of 15, with 15 itself being enclosed by the quadruplet (11, 13, 17, 19). 15 is also the number of supersingular primes. 15 is the […]

In Traction


    As you’ll know if you’ve stopped by here previously I do like a map. So I had a hugely successful visit to the local charity shops last week, (and yes there is a theme occurring here – I do spend a great deal of time in charity shops), picking up (amongst others) “Britain […]

Lost & Found


I was off work last week so got the chance to spend my time sifting through other people’s detritus aka charity shop shopping. Unfortunately I didn’t succeed in providing a new home to much, however hidden amongst the pages of a Penguin published edition of The Invisible Man from 1946 was this photograph. I love […]