I am not sure if I already blogged this but it's good enough to blog again:
The On-Line Encyclopedia of Integer Sequences. I randomly entered '1,8,14,21' and found that it belongs to the sequence: "Numbers n with property that 9*n is a sum of two distinct positive cubes". Good to know!
[Slightly irrelevant image from one of my favorite blogs,
Futility Closet. Highly recommended!]
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