A050760 Triangular numbers whose decimal expansion contains no pair of consecutive equal digits.

0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 703, 741, 780, 820, 861, 903, 946, 1035, 1081, 1275, 1326, 1378, 1431, 1485, 1540, 1596, 1653, 1830, 1891

Offset

1,3

Comments

For indices, see A050759.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Mathematica

Select[Accumulate[Range[0, 70]], FreeQ[Differences[IntegerDigits[#]], 0]&] (* Harvey P. Dale, Jun 20 2021 *)

Crossrefs

Cf. A043096, A000217, A050759.

Sequence in context: A277209 A361751 A089717 * A075057 A069792 A194153

Adjacent sequences: A050757 A050758 A050759 * A050761 A050762 A050763

Keyword

nonn,base

Author

Patrick De Geest, Sep 15 1999

Extensions

Offset changed to 1 by Jon E. Schoenfield, Oct 18 2019

Status

approved