A183225 Array: row r is the complement of the (r+1)-gonal numbers; by antidiagonals.

2, 4, 2, 5, 3, 2, 7, 5, 3, 2, 8, 6, 4, 3, 2, 9, 7, 6, 4, 3, 2, 11, 8, 7, 5, 4, 3, 2, 12, 10, 8, 7, 5, 4, 3, 2, 13, 11, 9, 8, 6, 5, 4, 3, 2, 14, 12, 10, 9, 8, 6, 5, 4, 3, 2, 16, 13, 11, 10, 9, 7, 6, 5, 4, 3, 2, 17, 14, 13, 11, 10, 9, 7, 6, 5, 4, 3, 2, 18

Offset

1,1

Links

Table of n, a(n) for n=1..79.

Example

Northwest corner:
2...4...5...7...8...9...11...12...13 (A145397)
2...3...5...6...7...8...10...11...12 (A000037)
2...3...4...6...7...8....9...10...11 (A183217)
2...3...4...5...7...8....9...10...11 (A183218)
2...3...4...5...6...8....9...10...11 (A183219)
2...3...4...5...6...7....9...10...11 (A183220)
2...3...4...5...6...7....8...10...11 (A183221)

Crossrefs

Cf. A086270 (array of the r-gonal numbers by rows),

A145397 (complement of the triangular numbers),

A000037 (complement of the squares),

A183217 (complement of the pentagonal numbers).

Sequence in context: A307664 A057037 A076920 * A366586 A020774 A291303

Adjacent sequences: A183222 A183223 A183224 * A183226 A183227 A183228

Keyword

nonn,tabl

Author

Clark Kimberling, Jan 01 2011

Status

approved