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A069700 Triangular numbers with internal digits 9. 8
0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 190, 496, 595, 990, 5995 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

For proof of finiteness see A069693.

LINKS

Table of n, a(n) for n=1..19.

MATHEMATICA

Do[ If[ Union[ Drop[ RotateLeft[ IntegerDigits[n(n + 1)/2]], -2]] == {9}, Print[n(n + 1)/2]], {n, 14, 10^6}]

CROSSREFS

Cf. A069675 to A069684, A069693 to A069700.

Sequence in context: A069699 A213516 A078254 * A069698 A069696 A025724

Adjacent sequences:  A069697 A069698 A069699 * A069701 A069702 A069703

KEYWORD

fini,full,nonn,base

AUTHOR

Amarnath Murthy, Apr 06 2002

STATUS

approved

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Last modified October 21 11:34 EDT 2017. Contains 293693 sequences.