A051788 a(1) = 1, a(2) = 3; for n>2, a(n) = least value > a(n-1) such that pairwise differences are unique.

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

Offset: 1

Author

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

Keywords

• nonn

Comments

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

Crossrefs

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