Search: id:A130202
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%I A130202
%S A130202 1,21,28,55,91,171,253,276,351,406,465,496,595,666,820,861,1081,1225,
%T A130202 1378,1431,1485,1540,1653,1770,1891,2211,2346,2485,2850,3003,3160,3240,
%U A130202 3403,3655,3916,4186,4371,4560,4753,4950
%N A130202 Odious triangular numbers.
%F A130202 a(n) = A130201(n)/2. Multiplication by 2 preserves odiousness, hence 
               this sequence is odious oblong numbers divided by 2.
%t A130202 Select[Table[n(n + 1)/2, {n, 100}], OddQ[Plus @@ IntegerDigits[ #, 2]] 
               &]
%Y A130202 Cf. This sequence is the intersection of odious (A000069) and triangular 
               (A000217) numbers.
%Y A130202 Sequence in context: A120735 A009727 A048012 this_sequence A162692 A048067 
               A166647
%Y A130202 Adjacent sequences: A130199 A130200 A130201 this_sequence A130203 A130204 
               A130205
%K A130202 nonn
%O A130202 0,2
%A A130202 Tanya Khovanova (tanyakh(AT)yahoo.com), May 16 2007

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