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A069505
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a(1) = 1; a(n) = smallest palindromic number of the form k*a(n-1) + 1 with k > 1.
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6
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1, 3, 7, 22, 111, 1111, 11111, 111111, 1111111, 11111111, 111111111, 1111111111, 11111111111, 111111111111, 1111111111111, 11111111111111, 111111111111111, 1111111111111111, 11111111111111111, 111111111111111111
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n) = {10^(n-2)-1}/9 for n > 4.
G.f.=(110*x^5-61*x^4-25*x^3-16*x^2-8*x+1)/(10*x-1)/(x-1) - Maksym Voznyy (voznyy(AT)mail.ru), Jan 10 2008
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MAPLE
| A069505:=seriestolist(taylor((1+110*x^5-61*x^4-25*x^3-16*x^2-8*x)/(10*x-1)/(x-1), x, 20)); - Maksym Voznyy (voznyy(AT)mail.ru), Jan 10 2008
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CROSSREFS
| Cf. A069506, A069507, A069508, A069509, A069510.
Sequence in context: A108070 A038147 A082271 * A173878 A032403 A072584
Adjacent sequences: A069502 A069503 A069504 * A069506 A069507 A069508
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KEYWORD
| nonn,base
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 30 2002.
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EXTENSIONS
| More terms from Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 11 2003.
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