Thursday, January 03, 2019
The digits of the year 2019 add up to twelve.
a) How many years ago did this last happen?
b) In what year?
c) How many years until it next happens?
d) In what year?
e) How many times will it happen this century?
f) What's the maximum number of times it can happen in a century?
g) In which century will this maximum next happen?
h) In which century did this maximum last happen?
i) When will there next be a 99-year gap?
j) When will there next be a longer gap?
k) When is the next century with no years when this happens?
l) How many times will it happen this millennium?
m) What else can you tell us about any underlying patterns?
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