%I A004163
%S A004163 1,5,21,22,53,15,7,29,711,541,671,12,742,782,33,673,524,
%T A004163 774,235,95,156,517,287,258,529,1001,801,2611,7421,5331,
%U A004163 6241,251,7161,7171,281,6291,5302,7412,2622,832,1052,5262
%N A004163 Pentagonal numbers written backwards.
%Y A004163 Cf. A000326.
%Y A004163 Sequence in context: A167202 A165204 A043053 this_sequence A113410 A099654 
               A042319
%Y A004163 Adjacent sequences: A004160 A004161 A004162 this_sequence A004164 A004165 
               A004166
%K A004163 nonn,base
%O A004163 1,2
%A A004163 N. J. A. Sloane (njas(AT)research.att.com).