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Numbers k such that k * (largest digit of k) is a triangular number.
0

%I #7 Apr 14 2024 23:24:37

%S 0,1,6,10,19,34,39,46,63,124,159,165,175,245,255,266,292,301,330,336,

%T 354,369,426,539,555,582,889,1036,1140,1273,1287,1292,1309,1449,1452,

%U 1463,1550,1645,1705,1790,1974,1995,2175,2189,2235,2301,2366,2369,2392

%N Numbers k such that k * (largest digit of k) is a triangular number.

%e 34 is a term because 34*4=136, a triangular number.

%Y Cf. A054055.

%K base,easy,nonn

%O 1,3

%A _Jason Earls_, Jul 17 2004