%I A139620
%S A139620 20,210,400,590,780,970,1160,1350,1540,1730,1920,2110,2300,2490,2680,
%T A139620 2870,3060,3250,3440,3630,3820,4010,4200,4390,4580,4770,4960,5150,5340,
%U A139620 5530,5720,5910,6100,6290,6480,6670,6860,7050,7240,7430
%N A139620 20th transversal numbers (or 20-transversal numbers): (A000217(20)-20)*n 
               + 20.
%C A139620 Numbers of the 20th column of positive numbers in the square array of 
               nonnegative and polygonal numbers A139600. Also, numbers of the 20th 
               column in the square array A057145.
%F A139620 a(n) = (A000217(20)-20)*n + 20 = (210-20)n + 20 = 190n + 20 = 10(19n 
               + 2).
%Y A139620 Cf. A001477, A000217, A000290, A000326, A000384, A000566, A000567, A001106, 
               A001107, A051682, A051624, A051865, A051866, A051867, A051868, A051869, 
               A051870, A000004, A000012, A000027, A008585, A016957, A017329, A139606, 
               A139607, A139608, A139609, A139610, A139611, A139612, A139613, A139614, 
               A139615, A139616, A139617, A139618, A139619, A057145, A086271, A139600, 
               A139601.
%Y A139620 Sequence in context: A133070 A135179 A074668 this_sequence A094311 A060853 
               A010972
%Y A139620 Adjacent sequences: A139617 A139618 A139619 this_sequence A139621 A139622 
               A139623
%K A139620 easy,nonn
%O A139620 0,1
%A A139620 Omar E. Pol (info(AT)polprimos.com), May 21 2008