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A119101 Triangular numbers composed of digits {1,2,5}. 2
1, 15, 21, 55, 1225, 2211, 5151, 15225, 21115, 22155, 151525, 222111, 255255, 11551221, 12552555, 21115251, 22221111, 51151555, 111221155, 251115255, 2222211111, 2552515525, 111251152551, 122515222515, 222222111111 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..25.

G. Resta, Tridigital Triangular Numbers

CROSSREFS

Cf. A000217, A031153, A119102. See A119033 for a table of cross-references.

Sequence in context: A275169 A063176 A083372 * A190662 A274084 A219918

Adjacent sequences:  A119098 A119099 A119100 * A119102 A119103 A119104

KEYWORD

nonn,base

AUTHOR

Giovanni Resta, May 10 2006

STATUS

approved

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Last modified February 21 03:02 EST 2020. Contains 332086 sequences. (Running on oeis4.)