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21, 56, 105, 168, 245, 336, 441, 560, 693, 840, 1001, 1176, 1365, 1568, 1785, 2016, 2261, 2520, 2793, 3080, 3381, 3696, 4025, 4368, 4725, 5096, 5481, 5880, 6293, 6720, 7161, 7616, 8085, 8568, 9065, 9576, 10101, 10640, 11193, 11760, 12341, 12936
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers such that 7 (7 + n) is a perfect square.
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1).
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MATHEMATICA
| Select[ Range[15000], IntegerQ[ Sqrt[ 7(7 + # )]] & ]
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PROG
| (PARI) a(n)= 7*n*(n+2) \\ Charles R Greathouse IV, Dec 07 2011
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CROSSREFS
| Cf. 8: A067728, 6: A067726, 5: A067724, 3: A067725.
Sequence in context: A083676 A145719 A031963 * A165237 A189004 A183310
Adjacent sequences: A067724 A067725 A067726 * A067728 A067729 A067730
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KEYWORD
| nonn,easy
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Feb 05 2002
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EXTENSIONS
| Edited by Charles R Greathouse IV (charles.greathouse(AT)case.edu), Jul 25 2010
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