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 A242313 Numbers belonging to a geometric sequence whose ratio is 2 and whose first term ends in 1. 0
 1, 2, 4, 8, 11, 16, 21, 22, 31, 32, 41, 42, 44, 51, 61, 62, 64, 71, 81, 82, 84, 88, 91, 101, 102, 111, 121, 122, 124, 128, 131, 141, 142, 151, 161, 162, 164, 168, 171, 176, 181, 182, 191, 201, 202, 204, 211, 221, 222, 231, 241, 242, 244, 248, 251, 256, 261 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Numbers such that A099551(n) = 1. Numbers of the form 2^m * (10n + 1). - Charles R Greathouse IV, May 14 2014 LINKS FORMULA a(n) = 5n + O(log n). - Charles R Greathouse IV, May 14 2014 EXAMPLE 176 is in sequence because it belongs to 11,22,44,88,176, with first term 11. 96, which belongs to 3,6,12,24,48,96 with first term 3, does not qualify. PROG (PARI) isok(n) = ((n/2^valuation(n, 2)) % 10) == 1; \\ Michel Marcus, May 14 2014 CROSSREFS Cf. A099551. Sequence in context: A320448 A115797 A336627 * A003596 A018600 A018408 Adjacent sequences:  A242310 A242311 A242312 * A242314 A242315 A242316 KEYWORD nonn,base,easy AUTHOR J. Lowell, May 10 2014 EXTENSIONS More terms from Michel Marcus, May 14 2014 STATUS approved

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Last modified September 19 16:46 EDT 2020. Contains 337178 sequences. (Running on oeis4.)