A139222 - OEIS

%I #31 Dec 31 2023 10:21:17

%S 3,33,63,93,123,153,183,213,243,273,303,333,363,393,423,453,483,513,

%T 543,573,603,633,663,693,723,753,783,813,843,873,903,933,963,993,1023,

%U 1053,1083,1113,1143,1173,1203,1233,1263,1293,1323,1353,1383,1413,1443,1473

%N a(n) = 30*n - 27.

%C Multiples of 3 with the units digit equal to 3.

%H Vincenzo Librandi, <a href="/A139222/b139222.txt">Table of n, a(n) for n = 1..2000</a>

%H <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1).

%F a(n) = a(n-1) + 30.

%t Range[3, 2000, 30] (* _Vladimir Joseph Stephan Orlovsky_, Jun 15 2011 *)

%t 30*Range[50]-27 (* or *) NestList[30+#&,3,50] (* _Harvey P. Dale_, Mar 27 2021 *)

%o (Magma) [30*n - 27: n in [1..60]]; // _Vincenzo Librandi_, Jun 17 2011

%o (PARI) a(n)=30*n-27 \\ _Charles R Greathouse IV_, Aug 25 2014

%Y Subsequence of A034709, together with A017281, A017293, A139245, A017329, A139249, A139264, A139279 and A139280.

%K nonn,easy

%O 1,1

%A _Odimar Fabeny_, Jun 06 2008

%E More terms from _Reinhard Zumkeller_, Jun 22 2008