

A011185


A B_2 sequence: a(n) = least value such that sequence increases and pairwise sums of distinct elements are all distinct.


16



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
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OFFSET

1,2


COMMENTS

a(n) = least positive integer > a(n1) and not equal to a(i)+a(j)a(k) for distinct i and j with 1 <= i,j,k <= n1. [Comment corrected by JeanPaul Delahaye, Oct 02 2020.]


LINKS

Klaus Brockhaus and Dan Hoey, Table of n, a(n) for n = 1..2839
Index entries for B_2 sequences.


FORMULA

a(n) = A010672(n1)+1.


CROSSREFS

Cf. A010672.
Cf. A033627, A003278, A026471, A066720, A075122, A075123, A133097.
Cf. A036241, A349777.
Sequence in context: A080787 A065124 A048817 * A240733 A283936 A278800
Adjacent sequences: A011182 A011183 A011184 * A011186 A011187 A011188


KEYWORD

nonn


AUTHOR

Dan Hoey


STATUS

approved



