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A051788 a(1) = 1, a(2) = 3; for n>2, a(n) = least value > a(n-1) such that pairwise differences are unique. 6
1, 3, 4, 8, 14, 22, 31, 46, 62, 82, 108, 137, 149, 171, 206, 259, 303, 367, 414, 479, 545, 578, 658, 728, 848, 921, 1004, 1130, 1268, 1352, 1454, 1584, 1669, 1876, 1915, 2114, 2303, 2404, 2563, 2797, 2991, 3112, 3270, 3423, 3592, 3773, 3889, 4284, 4727, 4819 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

A variation on A005282 (Mian-Chowla, where sums of pairs of elements are unique).

LINKS

Table of n, a(n) for n=1..50.

CROSSREFS

Cf. A005282, A080201 (for differences that do not occur).

Sequence in context: A310012 A181408 A004979 * A023623 A023558 A170902

Adjacent sequences:  A051785 A051786 A051787 * A051789 A051790 A051791

KEYWORD

nonn

AUTHOR

Gerald A. Mischke (Gerald.Mischke(AT)mutualofomaha.com), Dec 09 1999

STATUS

approved

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Last modified August 20 00:52 EDT 2018. Contains 313902 sequences. (Running on oeis4.)