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 A045049 Numbers whose base-4 representation contains exactly two 0's and two 2's. 1
 130, 136, 160, 266, 290, 296, 386, 392, 416, 518, 521, 523, 526, 530, 536, 545, 547, 548, 556, 562, 568, 578, 584, 608, 641, 643, 644, 652, 656, 688, 706, 712, 736, 778, 802, 808, 898, 904, 928, 1050, 1062, 1065, 1067, 1070 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Enrique Pérez Herrero, Table of n, a(n) for n = 1..100000 MATHEMATICA fQ[n_] := Block[{idn = IntegerDigits[n, 4]}, Count[idn, 0] == Count[idn, 2] == 2]; Select[Range@1100, fQ] (* Robert G. Wilson v, Dec 11 2017 *) PROG (Python) import numpy as np for a in range(10000): x = np.base_repr(a, base=4) if(x.count("0") == 2 and x.count("2") == 2): print(a) # Enrique Pérez Herrero, Dec 06 2017 CROSSREFS Cf. A007090. Sequence in context: A043604 A250740 A025372 * A163555 A025373 A025364 Adjacent sequences: A045046 A045047 A045048 * A045050 A045051 A045052 KEYWORD nonn,base AUTHOR Clark Kimberling STATUS approved

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Last modified May 26 05:37 EDT 2024. Contains 372807 sequences. (Running on oeis4.)