A116055 Triangular numbers whose representation is made of nontrivial runs of identical digits.

55, 66, 666, 2211, 222111, 339900, 1188111, 22221111, 88000011, 111221155, 553330011, 2200066611, 2222211111, 2233558866, 55666666611, 77771144466, 222222111111, 880022001111, 888000000111, 1111226666655, 5533355001111

Offset

1,1

Comments

A run of length 1 is trivial.

Links

Table of n, a(n) for n=1..21.

Example

T(14914) = 111221155.

Crossrefs

Cf. A033023.

Sequence in context: A269808 A004434 A168109 * A068898 A068899 A053719

Adjacent sequences: A116052 A116053 A116054 * A116056 A116057 A116058

Keyword

nonn,base

Author

Giovanni Resta, Feb 13 2006

Status

approved