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 A227915 Numbers of the form k + wt(k) for exactly four distinct k, where wt(k) = A000120(k) is the binary weight of k. 11
 4102, 12295, 20487, 28680, 36871, 45064, 53256, 61449, 69639, 77832, 86024, 94217, 102408, 110601, 118793, 126986, 135175, 143368, 151560, 159753, 167944, 176137, 184329, 192522, 200712, 208905, 217097, 225290, 233481, 241674, 249866, 258059, 266247, 274440, 282632, 290825, 299016, 307209, 315401, 323594, 331784, 339977 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Numbers occurring exactly four times in A092391: A228085(a(n)) = 4. For the first number that appears k times, see A230303. LINKS Donovan Johnson, Table of n, a(n) for n = 1..10000 EXAMPLE a(1) = 4102, the four k with A092391(k) = 4102 being: 4091 = '111111111011', A000120(4091) = 11, 4091 + 11 = 4102; 4092 = '111111111100', A000120(4092) = 12, 4092 + 10 = 4102; 4099 = '1000000000011', A000120(4099) = 3, 4099 + 3 = 4102; 4100 = '1000000000100', A000120(4100) = 2, 4100 + 2 = 4102. PROG (Haskell) a227915 n = a227915_list !! (n-1) a227915_list = filter ((== 4) . a228085) [1..] CROSSREFS Cf. A092391, A228085, A230092, A230091, A228088, A010061, A230093, A230303. Sequence in context: A043476 A168191 A045036 * A168345 A255158 A077188 Adjacent sequences:  A227912 A227913 A227914 * A227916 A227917 A227918 KEYWORD nonn,base AUTHOR Reinhard Zumkeller, Oct 13 2013 STATUS approved

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Last modified September 15 18:47 EDT 2019. Contains 327083 sequences. (Running on oeis4.)