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A068623
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a(1) = 8; a(n+1) = smallest triangular number > a(n) formed by adding at least one digit to a(n).
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3
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8, 28, 528, 18528, 184528, 18045028, 1800450028, 180004500028, 18000045000028, 1800000450000028, 180000004500000028, 18000000045000000028, 1800000000450000000028, 180000000004500000000028
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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FORMULA
| For n>=5, a(n) = 18*10^(2*n-6) + 45*10^(n-3) + 28 [From Max Alekseyev (maxale(AT)gmail.com), Apr 25 2009]
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CROSSREFS
| Cf. A068618, A068619, A068621, A068622, A068624.
Sequence in context: A152014 A200034 A146977 * A155578 A115107 A035339
Adjacent sequences: A068620 A068621 A068622 * A068624 A068625 A068626
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KEYWORD
| base,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Feb 25 2002
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EXTENSIONS
| 3 more terms from Ray G. Opao (1260(AT)email.com), Dec 14 2004
Extended by Max Alekseyev (maxale(AT)gmail.com), Apr 25 2009
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