Today is 21 day of the year.
21 = 3 x 7
21 is a lucky number.
21 is the third octagonal number.
21 is the third term in the Look and Say sequence.
21 is the sixth triangular number.
21 is the sixth Jacobsthal number.
21 is the eighth Fibonacci number.
21 is the thirteenth number in the Padovan sequence.
21 is a member of two primitive, Pythagorean triples (21, 20, 29) and (21, 220, 221).
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