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A011185 A B_2 sequence: a(n) = least value such that sequence increases and pairwise sums of distinct elements are all distinct. 12
1, 2, 3, 5, 8, 13, 21, 30, 39, 53, 74, 95, 128, 152, 182, 212, 258, 316, 374, 413, 476, 531, 546, 608, 717, 798, 862, 965, 1060, 1161, 1307, 1386, 1435, 1556, 1722, 1834, 1934, 2058, 2261, 2497, 2699, 2874, 3061, 3197, 3332, 3629, 3712, 3868, 4140, 4447, 4640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = least positive integer > a(n-1) and not a(i)+a(j)-a(k) for distinct i,j,k < n.

LINKS

Klaus Brockhaus and Dan Hoey, Table of n, a(n) for n = 1..2839

Index entries for B_2 sequences.

CROSSREFS

a(n) = A010672(n)+1.

Cf. A033627, A003278, A026471, A075122, A075123, A133097.

Sequence in context: A080787 A065124 A048817 * A240733 A055806 A023438

Adjacent sequences:  A011182 A011183 A011184 * A011186 A011187 A011188

KEYWORD

nonn

AUTHOR

Dan Hoey (Hoey(AT)AIC.NRL.Navy.Mil)

STATUS

approved

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Last modified April 17 20:01 EDT 2014. Contains 240655 sequences.