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A111216
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a(n)=31*a(n-1)-a(n-2).
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1
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1, 30, 929, 28769, 890910, 27589441, 854381761, 26458245150, 819351217889, 25373429509409, 785756963573790, 24333092441278081, 753540108716046721, 23335410277756170270, 722644178501725231649, 22378634123275726010849, 693015013643045781104670
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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COMMENTS
| Take 31 numbers consisting of 29 ones together with any two successive terms from this ssequence. This set has the property that the sum of their squares is 31 times their product. (Guy)
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LINKS
| Tanya Khovanova, Recursive Sequences
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FORMULA
| G.f.: (1-x)/(1-31*x+x^2). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Nov 18 2008]
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CROSSREFS
| Cf. A049685.
Sequence in context: A041421 A042742 A144350 * A158672 A004994 A061466
Adjacent sequences: A111213 A111214 A111215 * A111217 A111218 A111219
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), following a suggestion from R. K. Guy, Oct 26 2005
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