1, 3, 21, 55 only triangular Fibonacci numbers.
Any tetrahedral beyond 1?
1,144
only square Fib nmbrs. 1,3,21,55 only triangular Fib nmbrs. 2 only
oblong Fib nmbr. 1,8 only cubes. (Weird!) Any tetrahedral beyond 1?
— James Tanton (@jamestanton) January 21, 2014
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