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A050760
Triangular numbers whose decimal expansion contains no pair of consecutive equal digits.
2
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
MATHEMATICA
Select[Accumulate[Range[0, 70]], FreeQ[Differences[IntegerDigits[#]], 0]&] (* Harvey P. Dale, Jun 20 2021 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Patrick De Geest, Sep 15 1999
EXTENSIONS
Offset changed to 1 by Jon E. Schoenfield, Oct 18 2019
STATUS
approved