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 A161980 a(n) = the smallest positive multiple of n containing {the string made by reversing the order of the binary digits of n, and removing leading 0's} as a substring when a(n) is written in binary. 2
 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 55, 12, 91, 14, 15, 16, 17, 18, 57, 20, 21, 110, 253, 24, 275, 182, 27, 28, 87, 30, 31, 32, 33, 34, 455, 36, 333, 114, 741, 40, 1189, 42, 215, 220, 45, 506, 893, 48, 931, 550, 51, 364, 689, 54, 495, 56, 627, 174, 885, 60, 1403, 62, 63, 64 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Table of n, a(n) for n=1..64. EXAMPLE 13 in binary is 1101, which reversed is 1011. a(13) = the positive multiple of 13 that contains the string 1011 as a substring in its binary representation. a(13) therefore equals 91 = 7*13, which is 1011011 in binary. (Binary 91 actually contains the substring 1011 twice.) CROSSREFS Cf. A030101, A161979. Sequence in context: A062683 A363765 A137857 * A183533 A132576 A161948 Adjacent sequences: A161977 A161978 A161979 * A161981 A161982 A161983 KEYWORD base,nonn AUTHOR Leroy Quet, Jun 23 2009 EXTENSIONS Extended by Ray Chandler, Mar 12 2010 STATUS approved

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Last modified February 23 06:06 EST 2024. Contains 370267 sequences. (Running on oeis4.)