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Search: id:A130201
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| A130201 |
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Odious oblong (pronic) numbers. |
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+0
2
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| 2, 42, 56, 110, 182, 342, 506, 552, 702, 812, 930, 992, 1190, 1332, 1640, 1722, 2162, 2450, 2756, 2862, 2970, 3080, 3306, 3540, 3782, 4422, 4692, 4970, 5700, 6006, 6320, 6480, 6806, 7310, 7832, 8372, 8742, 9120, 9506, 9900
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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a(n) = 2*A130202(n). Multiplication by 2 preserves odiousness, hence this sequence is twice odious triangular numbers.
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MATHEMATICA
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Select[Table[n(n + 1), {n, 100}], OddQ[Plus @@ IntegerDigits[ #, 2]] &]
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CROSSREFS
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Cf. This sequence is the intersection of odious (A000069) and oblong (A002378) numbers.
Sequence in context: A113634 A098634 A076391 this_sequence A076392 A048373 A066563
Adjacent sequences: A130198 A130199 A130200 this_sequence A130202 A130203 A130204
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KEYWORD
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nonn
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AUTHOR
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Tanya Khovanova (tanyakh(AT)yahoo.com), May 16 2007
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