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 A119037 Triangular numbers composed of digits {0,1,4}. 2
 1, 10, 10011, 10440, 41041, 41001040, 141044410, 1010004040, 4104044101, 14041444410, 114011410040100, 440404440401100, 1041401040044401, 40114114410110140, 14001400401400441011, 1040410404040110411004140 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS G. Resta, Tridigital Triangular Numbers MATHEMATICA Rest[Select[FromDigits/@Tuples[{0, 1, 4}, 12], IntegerQ[(Sqrt[8 # + 1] - 1)/2] &]] (* Vincenzo Librandi, Dec 18 2015 *) PROG (Magma) [t: n in [1..2*10^7] | Set(Intseq(t)) subset {0, 1, 4} where t is n*(n+1) div 2]; // Vincenzo Librandi, Dec 18 2015 CROSSREFS Cf. A000217, A058414, A119038. See A119033 for a table of cross-references. Sequence in context: A283890 A139109 A317959 * A327232 A266841 A267677 Adjacent sequences: A119034 A119035 A119036 * A119038 A119039 A119040 KEYWORD nonn,base AUTHOR Giovanni Resta, May 10 2006 STATUS approved

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Last modified November 28 19:17 EST 2022. Contains 358421 sequences. (Running on oeis4.)