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A119120 Numbers k such that the k-th triangular number contains only digits {1,3,8}. 2
1, 2, 421, 1541, 8753, 150421, 12914246, 1327696379533, 4034385661121, 605166395826533, 16360402306368458, 249752330575267378 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Next term exceeds 4.4*10^18.

LINKS

Table of n, a(n) for n=1..12.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119119. See A119034 for a table of cross-references.

Sequence in context: A177321 A080392 A154541 * A332142 A109931 A326364

Adjacent sequences:  A119117 A119118 A119119 * A119121 A119122 A119123

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

EXTENSIONS

Two more terms from Max Alekseyev, May 12 2009

STATUS

approved

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Last modified October 28 17:59 EDT 2021. Contains 348329 sequences. (Running on oeis4.)