A133149 - OEIS

%I #2 Mar 31 2012 10:26:06

%S 206,9223,211763,3229763,46218553,651191243,8437304723

%N Greatest product of two primes made up together of digits 0 to n once.

%e We have

%e a(3) = 103*2 = 206.

%e a(4) = 401*23 = 9223.

%e a(5) = 503*421 = 211763.(and not 523*401 which is smaller)

%e a(6) = 6421*503 = 3229763.(and not 5021*643 which is smaller)

%e a(7) = 7451*6203 = 46218553.(and not 7043*6521 which is smaller)

%e a(8) = 85201*7643 = 651191243.(and not 76423*8501 which is smaller)

%e a(9) = 96401*87523 = 8437304723.(and not 96703*84521 which is smaller)

%Y Cf. A125722.

%K fini,full,nonn,base

%O 3,1

%A _Lekraj Beedassy_, Dec 16 2007