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Search: id:A138365
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| 10, 99, 1090, 11880, 129601, 1413720, 15421330, 168220899, 1835008570, 20016873360
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OFFSET
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1,1
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COMMENT
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1/3 = 3/10 + 3/99 + 3/1090, + 3/11880 + ..., = 3/(1*10) + 3/(3*33) + 3/(10*109) + 3/(33*360) + ...
Odd n terms == 1 mod 9; even n terms == 0 mod 9
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FORMULA
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a(n), n>0 = A006190(n) * A006190(n+2), where A006190 = (1, 3, 10, 33, 109, 360,...)
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EXAMPLE
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a(3) = 1090 = A006190(3) * A006190(5) = 10 * 109
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CROSSREFS
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Cf. A006190.
Adjacent sequences: A138362 A138363 A138364 this_sequence A138366 A138367 A138368
Sequence in context: A004189 A105694 A000456 this_sequence A119589 A107411 A019513
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KEYWORD
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nonn
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AUTHOR
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Gary W. Adamson (qntmpkt(AT)yahoo.com), Mar 16 2008
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