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A092734 Numbers n occurring in binary representation of n*(n+1)/2. 0
1, 3, 7, 13, 15, 20, 31, 63, 72, 82, 109, 127, 141, 177, 243, 255, 272, 511, 693, 886, 1023, 1056, 1311, 1350, 1480, 2047, 2130, 2378, 3812, 4039, 4095, 4160, 4982, 5422, 5546, 6906, 6933, 7365, 7956, 8191, 9418, 11531, 12465, 13069, 13713 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..45.

Index entries for sequences related to binary expansion of n

EXAMPLE

n=13->'1101', 13*(13+1)/2=91->'1011011': '..1101.', therefore 13 is a term.

CROSSREFS

Cf. A007088, A000217.

Sequence in context: A064829 A035496 A056530 * A209839 A192854 A002236

Adjacent sequences:  A092731 A092732 A092733 * A092735 A092736 A092737

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Apr 12 2004

STATUS

approved

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Last modified May 19 22:35 EDT 2013. Contains 225436 sequences.