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15, 40, 75, 120, 175, 240, 315, 400, 495, 600, 715, 840, 975, 1120, 1275, 1440, 1615, 1800, 1995, 2200, 2415, 2640, 2875, 3120, 3375, 3640, 3915, 4200, 4495, 4800, 5115, 5440, 5775, 6120, 6475, 6840, 7215, 7600, 7995, 8400, 8815, 9240, 9675
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Numbers such that 5 (5 + 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[10000], IntegerQ[ Sqrt[ 5(5 + # )]] & ]
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PROG
| (PARI) a(n)=5*n*(n+2) \\ Charles R Greathouse IV, Dec 07 2011
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CROSSREFS
| Cf. 8: A067728, 7: A067727, 6: A067726, 3: A067725.
Sequence in context: A062222 A044092 A044473 * A005337 A160891 A175926
Adjacent sequences: A067721 A067722 A067723 * A067725 A067726 A067727
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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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