A108634 - OEIS

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A108634

Semiprimes with ordered digits.

%I #3 Mar 30 2012 17:26:17

%S 4,6,9,14,15,22,25,26,33,34,35,38,39,46,49,55,57,58,69,77,111,115,118,

%T 119,122,123,129,133,134,145,146,155,158,159,166,169,177,178,226,235,

%U 237,247,249,259,267,278,289,299,334,335,339,346,355,358,377,445,446

%N Semiprimes with ordered digits.

%t Select[Range[1000], Plus@@Last/@FactorInteger[ # ]==2&&OrderedQ[IntegerDigits[ # ]]&]

%K nonn,base

%O 1,1

%A _Zak Seidov_, Jun 14 2005