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Search: id:A075123
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A075123 a(n) = least positive integer > a(n-1) and not 2*a(i)+a(j) for 1<=i<j<n. +0
4
1, 2, 3, 6, 9, 14, 17, 22, 25, 30, 33, 38, 41, 46, 49, 54, 57, 62, 65, 70, 73, 78, 81, 86, 89, 94, 97, 102, 105, 110, 113, 118, 121, 126, 129, 134, 137, 142, 145, 150, 153, 158, 161, 166, 169, 174, 177, 182, 185, 190, 193, 198, 201, 206, 209, 214, 217, 222, 225, 230 (list; graph; listen)
OFFSET

1,2

FORMULA

4n - 10 - (n mod 2), for n>3. G.f.: [1+x-3x^2+2x^3+5x^4+3x^6]/[(1+x)(1-x)^2]. Proved by Marc Schwartz. - R. Stephan, Nov 16 2004

CROSSREFS

Cf. A033627, A003278, A026471, A075122.

Sequence in context: A018347 A039903 A128955 this_sequence A023559 A008823 A127719

Adjacent sequences: A075120 A075121 A075122 this_sequence A075124 A075125 A075126

KEYWORD

nonn

AUTHOR

Floor van Lamoen (fvlamoen(AT)hotmail.com), Sep 02 2002

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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