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A118128
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Numbers n such that the sum of the first n odd composites is palindromic in base 2.
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0
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1, 3, 7, 19, 137, 139, 155, 379, 1509, 4877, 9509, 13015, 44819, 75595, 245027, 804463, 1082053, 1154293, 5802669, 10186839, 52333761, 81509017, 130656729, 375417331, 476594459, 1955429145, 9051994251, 12788782787
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OFFSET
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1,2
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LINKS
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EXAMPLE
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The sum of the first 19 odd composites, when written in binary, is the palindrome 1101111011, so 19 is in the sequence.
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CROSSREFS
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Cf. A058848 (palindromic in base 10).
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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