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Search: id:A069694
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| A069694 |
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Triangular numbers with internal digits 2. |
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+0
1
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| 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 120, 325, 528, 820, 1225
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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Is the sequence finite?
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MATHEMATICA
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Do[ If[ Union[ Drop[ RotateLeft[ IntegerDigits[n(n + 1)/2]], -2]] == {2}, Print[n(n + 1)/2]], {n, 14, 2 10^6}]
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CROSSREFS
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Cf. A069675 to A069684, A069693 to A067000.
Sequence in context: A077366 A077368 A069693 this_sequence A069695 A069697 A069699
Adjacent sequences: A069691 A069692 A069693 this_sequence A069695 A069696 A069697
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KEYWORD
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more,nonn,base
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 06 2002
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