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A077368
Triangular numbers whose external digits as well as internal digits form triangular numbers.
4
0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 231, 435, 465, 666, 1035, 2211, 3916, 4005, 6216, 6786, 19900, 41905, 46665, 48205, 162165, 171405, 200661, 222111, 329266, 400065, 1057785, 1646205, 2003001, 2318781, 2943951, 10628355
OFFSET
1,3
COMMENTS
Intersection of A077366 and A077367.
CROSSREFS
Sequence in context: A025731 A077367 A077366 * A069693 A069694 A069695
KEYWORD
base,easy,nonn
AUTHOR
Amarnath Murthy, Nov 06 2002
EXTENSIONS
Extended by Ray Chandler, Feb 28 2007
Offset changed by Andrew Howroyd, Sep 19 2024
STATUS
approved