id:A163807 - OEIS Search Results

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Reverse the order of inner digits (all digits but the first and last) of n written in binary. a(n) = the decimal value of the result.

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1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 13, 10, 11, 14, 15, 16, 17, 24, 25, 20, 21, 28, 29, 18, 19, 26, 27, 22, 23, 30, 31, 32, 33, 48, 49, 40, 41, 56, 57, 36, 37, 52, 53, 44, 45, 60, 61, 34, 35, 50, 51, 42, 43, 58, 59, 38, 39, 54, 55, 46, 47, 62, 63, 64, 65, 96, 97, 80, 81, 112, 113, 72 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`This is a self-inverse permutation of the positive integers.`
	EXAMPLE	`18 in binary is 10010. The inner digits are 001. Reverse these, leaving the first digit (a 1) and the last digit (a 0) untouched, and we have 11000. a(18) is the decimal equivalent of 11000, which is 24.`
	CROSSREFS	`Sequence in context: A029970 A143265 A109841 this_sequence A118766 A136399 A056167` `Adjacent sequences: A163804 A163805 A163806 this_sequence A163808 A163809 A163810`
	KEYWORD	`base,nonn`
	AUTHOR	`Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Aug 04 2009`
	EXTENSIONS	`More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 27 2009`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

AT&T Labs Research