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A119081 Triangular numbers composed of digits {0,5,7}. 2
55, 5050, 7750, 70500, 500500, 50005000, 5000050000, 500000500000, 7700750050575, 50000005000000, 5000000050000000, 75075057775077570, 500000000500000000, 7550055000555057000, 50000000005000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A119082. See A119033 for a table of cross-references.

Sequence in context: A103918 A013537 A056567 * A119051 A119083 A037156

Adjacent sequences: A119078 A119079 A119080 * A119082 A119083 A119084

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified December 6 18:09 EST 2022. Contains 358644 sequences. (Running on oeis4.)