"""
I figured it was one of these:
https://oeis.org/search?q=1%2C3%2C4%2C6%2C8%2C9%2C10%2C13%2C15&language=english&go=Searchhttps://oeis.org/search?q=1%2C3%2C5%2C6%2C8%2C10%2C12%2C13%2C15&language=english&go=Search
Were it so, we'd need the next number {16,17} to tell the difference.
But like many of Nick's riddles, I have no idea what he intended.
"""
Those are some nice sequences. I appreciate the first for being
discoverable, relating triangle numbers to squares. The second sort of
scares me in the way that Diophantine Approximations by Niven sort of
scares me. Yeah, I have no idea the origin of his riddle.
.- .-.. .-.. / ..-. --- --- - . .-. ... / .- .-. . / .-- .-. --- -. --. / ...
--- -- . / .- .-. . / ..- ... . ..-. ..- .-..
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