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A094765
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n + 2 * square excess of n.
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3
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0, 1, 4, 7, 4, 7, 10, 13, 16, 9, 12, 15, 18, 21, 24, 27, 16, 19, 22, 25, 28, 31, 34, 37, 40, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69, 72, 49, 52, 55, 58, 61, 64, 67, 70, 73, 76, 79, 82, 85, 88, 91, 64, 67, 70, 73, 76, 79, 82, 85, 88, 91
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| S. H. Weintraub, An interesting recursion, Amer. Math. Monthly, 111 (No. 6, 2004), 528-530.
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LINKS
| S. H. Weintraub, An interesting recursion, Amer. Math. Monthly, 111 (No. 6, 2004), 528-530.
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FORMULA
| a(n) = n + 2*A053186(n).
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CROSSREFS
| Cf. A053186, A002061, A094766.
Sequence in context: A010712 A081884 A059143 * A170863 A021682 A094692
Adjacent sequences: A094762 A094763 A094764 * A094766 A094767 A094768
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 10 2004
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