A119158 - OEIS

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A119158

Triangular numbers composed of digits {2,4,5}.

2

45, 55, 25425, 255255, 22542255, 244525555, 2245524452445, 2445254445525, 5255545252454245, 444222245455224445, 4544525455555255444225, 5554545454254522254255544522452525245

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

a(13) > 10^40.

LINKS

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

G. Resta, Tridigital Triangular Numbers.

FORMULA

a(n) = A000217(A119159(n)).

CROSSREFS

Cf. A000217, A031152, A119159. See A119033 for a table of cross-references.

Sequence in context: A119208 A068812 A119071 * A119204 A119206 A060463

Adjacent sequences: A119155 A119156 A119157 * A119159 A119160 A119161

KEYWORD

nonn,base,more

AUTHOR

Giovanni Resta, May 10 2006

EXTENSIONS

a(12) from Max Alekseyev, Aug 19 2013

STATUS

approved