A280636 - OEIS

%I #20 Jan 10 2017 07:20:52

%S 111,122,133,155,166,177,326,339,515,717,818,2918,3721,5315,6742,7214,

%T 7642,9327,9763,11111,11333,11555,12929,13333,13535,13565,13791,13939,

%U 14114,14141,14242,14545,15115,15151,15353,15454,15757,16161,16565

%N Semiprime numbers whose digit string can be partitioned into three parts such that the product of the first two parts equals the third part.

%C Could be called semiprime area numbers. If the first set of digits of the number is considered the length, the second set of digits of the number is considered the width, and the final set of digits of the number is considered the area, then length * width = area.

%F A001358 INTERSECT A280635.

%e 2918 is semiprime (2*1459) and an area number (2*9 = 18).

%e 6742 is semiprime (2*3371) and an area number (6*7 = 42).

%e Leading zeros are not allowed.

%Y Cf. A088294, A280635.

%K nonn,base

%O 1,1

%A _Randy L. Ekl_, Jan 06 2017