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A090773 Numbers that are congruent to {4, 6} mod 10. 3
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; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..57.

Index entries for 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). [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

MATHEMATICA

#+{4, 6}&/@(10Range[0, 50])//Flatten (* or *) LinearRecurrence[{1, 1, -1}, {4, 6, 14}, 100] (* Harvey P. Dale, Jun 05 2017 *)

CROSSREFS

Cf. A090298.

Sequence in context: A089377 A310620 A310621 * A310622 A310623 A310624

Adjacent sequences:  A090770 A090771 A090772 * A090774 A090775 A090776

KEYWORD

nonn

AUTHOR

Giovanni Teofilatto, Feb 07 2004

EXTENSIONS

Edited and extended by Ray Chandler, Feb 10 2004

STATUS

approved

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Last modified October 22 18:11 EDT 2021. Contains 348175 sequences. (Running on oeis4.)