"Counting in their heads" - 1895 oil painting

[EdS2]

Indeed, grsbanks, I too had a sense of impending relief as I summed the last two terms first (for no special reason.)

But Albert, you have been much more mathematical! Thanks for the link to your thread, which in turn links to some older threads. Some good material in there.

I'm tempted to say that if I were the same distance from 16 as I am presently from 60 I might have been able to see deeper into this challenge. It seems my head is now filled with pink blancmange.