A065226 - cp's OEIS frontend

A065226 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the decagonal numbers. The final elements of the rows form a(n).

%I A065226 #9 Nov 01 2024 15:08:05
%S A065226 1,2,5,9,4,10,17,25,7,17,28,40,1,15,30,46,63,81,15,35,56,78,101,125,
%T A065226 24,50,77,105,134,164,20,52,85,119,154,190,227,33,72,112,153,195,238,
%U A065226 282,30,76,123,171,220,270,321,3,56,110,165,221,278,336,395,4,65,127,190
%N A065226 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the decagonal numbers. The final elements of the rows form a(n).
%Y A065226 Cf. A001107.
%Y A065226 Mini-index to these sequences: A064766, A064865, A064866, A065221-A655234 are all of the same type. See A064766 for a detailed explanation.
%K A065226 easy,nonn
%O A065226 0,2
%A A065226 _Floor van Lamoen_, Oct 22 2001

cp's OEIS Frontend

A065226 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the decagonal numbers. The final elements of the rows form a(n).