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A090773 Numbers that are congruent to {4, 6} mod 10. 1
4, 6, 14, 16, 24, 26, 34, 36, 44, 46, 54, 56, 64, 66, 74, 76, 84, 86, 94, 96, 104, 106, 114, 116, 124, 126, 134, 136, 144, 146, 154, 156, 164, 166, 174, 176, 184, 186, 194, 196, 204, 206, 214, 216, 224, 226, 234, 236, 244, 246, 254, 256, 264, 266, 274, 276, 284 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

LINKS

Index to sequences with linear recurrences with constant coefficients, signature (1,1,-1)

FORMULA

a(n) = 2 * A047221(n) = 5*n-5/2-3*(-1)^n/2.

a(n)=10*n-a(n-1)-10 (with a(1)=4) [From Vincenzo Librandi, Nov 16 2010]

G.f.  2*x*(2+x+2*x^2)  / ( (1+x)*(x-1)^2 ). - R. J. Mathar, Oct 08 2011

CROSSREFS

Cf. A090298.

Sequence in context: A102029 A029641 A089377 * A024461 A063811 A157616

Adjacent sequences:  A090770 A090771 A090772 * A090774 A090775 A090776

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto (g.teofilatto(AT)tiscalinet.it), Feb 07 2004

EXTENSIONS

Edited and extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Feb 10 2004

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Last modified February 15 13:13 EST 2012. Contains 205791 sequences.