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A090772
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Numbers that are congruent to {2, 8} mod 10.
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1
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2, 8, 12, 18, 22, 28, 32, 38, 42, 48, 52, 58, 62, 68, 72, 78, 82, 88, 92, 98, 102, 108, 112, 118, 122, 128, 132, 138, 142, 148, 152, 158, 162, 168, 172, 178, 182, 188, 192, 198, 202, 208, 212, 218, 222, 228, 232, 238, 242, 248, 252, 258, 262, 268, 272, 278, 282
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Their square ends in the digit 4. - Kausthub Gudipati, Sep 08 2011
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1).
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FORMULA
| a(n) = 2 * A047209(n).
a(n) = 10*n-a(n-1)-10 (with a(1)=2). - Vincenzo Librandi, Nov 16 2010
G.f.: 2*x*(1+3*x+x^2)/((1+x)*(1-x)^2). - Bruno Berselli, Sep 08 2011
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CROSSREFS
| Cf. A090298.
Sequence in context: A067884 A005880 A046470 * A046525 A057265 A099418
Adjacent sequences: A090769 A090770 A090771 * A090773 A090774 A090775
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KEYWORD
| nonn,easy
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AUTHOR
| Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Feb 07 2004
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EXTENSIONS
| Edited and extended by Ray Chandler, Feb 10 2004
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