A091270 - OEIS

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A091270

Smallest number having in binary representation a prefix of length n that is also a suffix of its successor.

0, 2, 5, 13, 29, 61, 125, 253, 509, 1021, 2045, 4093, 8189, 16381, 32765, 65533, 131069, 262141, 524285, 1048573, 2097149, 4194301, 8388605, 16777213, 33554429, 67108861, 134217725, 268435453, 536870909, 1073741821 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`A091269(a(n)) = n and A091269(m) < n for m<a(n);` `a(n) = 2^(n+1) - 3 for n>2, cf. A036563.`
	LINKS	`Index entries for sequences related to binary expansion of n` `Eric Weisstein's World of Mathematics, Binary`
	CROSSREFS	`Cf. A007088.` `Sequence in context: A011756 A050950 A079991 * A045703 A178444 A122025` `Adjacent sequences: A091267 A091268 A091269 * A091271 A091272 A091273`
	KEYWORD	`nonn,base`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Dec 27 2003`

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Last modified February 17 04:58 EST 2012. Contains 205985 sequences.