A176423 Numbers that are the sum of at least three distinct nonnegative integers in arithmetic progression.

3, 6, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30, 32, 33, 34, 35, 36, 38, 39, 40, 42, 44, 45, 46, 48, 49, 50, 51, 52, 54, 55, 56, 57, 58, 60, 62, 63, 64, 65, 66, 68, 69, 70, 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86, 87, 88, 90, 91, 92, 93, 94, 95, 96, 98, 99, 100

Offset: 1

Author

Christian Amet, Apr 17 2010

Keywords

• nonn
• easy

Comments

According to the theorem in the December 1996 issue of Le Petit Vert, these numbers consist of 3, 6 and the composite numbers greater than 8. - Peter Munn, Aug 20 2024

Links

• Ray Chandler, Table of n, a(n) for n = 1..10000
• Le Petit Vert, Problem 47, p.20, September 1996. (in French)
• Le Petit Vert, Solution of problem 47, pp. 21-22, December 1996. (in French)

Crossrefs

Cf. A002808.

Extensions

Extended by Ray Chandler, Mar 23 2016