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A119036 Numbers n such that the n-th triangular number contains only digits {0,1,3}. 2
1, 2, 4, 24, 77, 141, 778, 1421, 1435, 1620, 14220, 15035, 45453, 148533, 148546, 249122, 471404, 791597, 4497399, 2580747997, 47180737658, 148411814220, 244989930458, 447283652733, 1422190795997, 2581981034024 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

G. Resta, Tridigital Triangular Numbers

MATHEMATICA

Select[Range[2 10^7], Complement[IntegerDigits[Binomial[# + 1, 2]], {0, 1, 3}] == {}&] (* Vincenzo Librandi, Oct 07 2015 *)

PROG

(MAGMA) [n: n in [1..2*10^7] | Set(Intseq(Binomial(n+1, 2))) subset [0, 1, 3]]; // Vincenzo Librandi, Oct 07 2015

CROSSREFS

Cf. A000217, A119035. See A119034 for a table of cross-references.

Sequence in context: A272640 A192513 A192384 * A192382 A232205 A170931

Adjacent sequences:  A119033 A119034 A119035 * A119037 A119038 A119039

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified July 21 12:36 EDT 2017. Contains 289642 sequences.