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A139245 a(n) = 20*n - 16. 17
4, 24, 44, 64, 84, 104, 124, 144, 164, 184, 204, 224, 244, 264, 284, 304, 324, 344, 364, 384, 404, 424, 444, 464, 484, 504, 524, 544, 564, 584, 604, 624, 644, 664, 684, 704, 724, 744, 764, 784, 804, 824, 844, 864, 884, 904, 924, 944, 964, 984, 1004, 1024, 1044 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Multiples of 4 with the unit digit equal to 4.

Positive integers that are the product of two integers ending with 2 (see A017293). - Stefano Spezia, Jul 25 2021

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..2000

Index entries for linear recurrences with constant coefficients, signature (2,-1).

FORMULA

a(n) = a(n-1) + 20.

a(n) = 20*n - 16, with n >= 1. - Paolo P. Lava, Sep 06 2010

a(n) = 4*A016861(n-1). - Wesley Ivan Hurt, Jan 17 2014

From Stefano Spezia, Jul 25 2021: (Start)

O.g.f.: 4*x*(1 + 4*x)/(1 - x)^2.

E.g.f.: 16 + 4*exp(x)*(5*x - 4).

a(n) = 2*a(n-1) - a(n-2) for n > 2. (End)

MAPLE

A139245:=n->20*n-16; seq(A139245(n), n=1..100); # Wesley Ivan Hurt, Jan 17 2014

MATHEMATICA

Range[4, 1500, 20] (* Vladimir Joseph Stephan Orlovsky, Jun 01 2011 *)

PROG

(MAGMA) [20*n-16: n in [1..60]]; // Vincenzo Librandi, Jun 19 2011

(PARI) a(n)=20*n-16 \\ Charles R Greathouse IV, Aug 25 2014

CROSSREFS

Subsequence of A034709, together with A017281, A017293, A139222, A017329, A139249, A139264, A139279 and A139280.

Cf. A017293.

Sequence in context: A120622 A031117 A174178 * A224242 A066770 A080380

Adjacent sequences:  A139242 A139243 A139244 * A139246 A139247 A139248

KEYWORD

easy,nonn

AUTHOR

Odimar Fabeny, Jun 06 2008

EXTENSIONS

More terms from Reinhard Zumkeller, Jun 22 2008

STATUS

approved

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Last modified May 21 05:37 EDT 2022. Contains 353889 sequences. (Running on oeis4.)