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A268228
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a(n) = sum of digits of (2n + 1)^2.
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2
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1, 9, 7, 13, 9, 4, 16, 9, 19, 10, 9, 16, 13, 18, 13, 16, 18, 10, 19, 9, 16, 22, 9, 13, 7, 9, 19, 10, 18, 16, 13, 27, 13, 25, 18, 10, 19, 18, 25, 13, 18, 31, 16, 27, 19, 19, 27, 16, 22, 18, 4, 16, 9, 19, 19, 9, 25, 13, 27, 13, 16, 18, 19, 19, 18, 16, 31, 18, 31, 16, 27, 19, 10, 18, 7, 13, 18
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listen;
history;
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OFFSET
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0,2
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LINKS
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FORMULA
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MAPLE
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f:= n -> convert(convert((2*n+1)^2, base, 10), `+`):
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MATHEMATICA
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PROG
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(PARI) a(n) = sumdigits((2*n+1)^2); \\ Michel Marcus, Jul 23 2016
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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