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Key terms:
math
number
rightarrow
base
sum
digits
we
prime
types
happy numbers
above
sequence
span
those that eventually reach
largest
fact
unhappy number
cycle
cubes
below
less than
process
happy prime
positive
perpetually produces itself
eventually reach the loop
interval
integer
decimal
mathematics
all numbers
interesting
any number
sum of the squares
known happy
will always
number above
largest known
if and only if
infinitely many
squares of the digits
strictly smaller
exhaustive search
multiple of three
other than the happy numbers
different types of unhappy number
produces the largest next value
Search external links cited by footnotes on Wikipedia page Happy number:
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