Search: id:A106554
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%I A106554
%S A106554 22,23,33,25,27,35,37,211,55,213,311,217,57,219,313,223,77,317,511,319,
%T A106554 22,9,231,513,323,237,711,241,517,243,329,713,331,247,519,253,337,523,
%U A106554 259,717,1111,261,341,343,719,267,347,271,1113,529,273,531,279,353,723
%N A106554 Concatenation of the two divisors of a semiprime, smallest divisor first.
%C A106554 Concatenation of the divisors starting with the largest one leads to 
               another sequence.
%e A106554 First semiprime is 4; 4 is 2*2 -> 22.
%e A106554 Second semiprime is 6; 6 is 2*3 -> 23.
%e A106554 Third semiprime is 9; 9 is 3*3 -> 33.
%e A106554 Fourth semiprime is 10; 10 is 2*5 -> 25.
%Y A106554 Cf. A106550, A084126, A084127, A001358.
%Y A106554 Sequence in context: A091404 A146755 A106556 this_sequence A118297 A022392 
               A041976
%Y A106554 Adjacent sequences: A106551 A106552 A106553 this_sequence A106555 A106556 
               A106557
%K A106554 base,easy,nonn
%O A106554 1,1
%A A106554 Eric Angelini (eric.angelini(AT)kntv.be), May 09 2005
%E A106554 More terms from Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), 
               May 19 2005

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