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A062295
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A B_2 sequence: a(n) is the smallest square such that pairwise sums of not necessarily distinct elements are all distinct.
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4
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1, 4, 9, 16, 25, 36, 64, 81, 100, 169, 256, 289, 441, 484, 576, 625, 841, 1089, 1296, 1444, 1936, 2025, 2401, 2601, 3136, 4225, 4356, 4624, 5329, 5476, 5776, 6084, 7569, 9025, 10201, 11449, 11664, 12321, 12996, 13456, 14400, 16129, 17956, 20164, 22201
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Klaus Brockhaus, Table of n, a(n) for n = 1..4944
Eric Weisstein's World of Mathematics, B2-Sequence
Index entries for B_2 sequences
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EXAMPLE
| 36 is in the sequence since the pairwise sums of {1, 4, 9, 16, 25, 36} are all distinct: 2, 5, 8, 10, 13, 17, 18, 20, 25, 26, 29, 32, 34, 37, 40, 41, 45, 50, 52, 61, 72.
49 is not in the sequence since 1 + 49 = 25 + 25.
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CROSSREFS
| Cf. A000290, A011185, A010672, A025582, A005282, A062292, A133743, A133744.
Sequence in context: A028820 A122683 A072862 * A068802 A075056 A022779
Adjacent sequences: A062292 A062293 A062294 * A062296 A062297 A062298
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KEYWORD
| nonn
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AUTHOR
| Labos E. (labos(AT)ana.sote.hu), Jul 02 2001
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EXTENSIONS
| Edited, corrected and extended by Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), Sep 24 2007
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