A084841 Write the numbers 1, 2, ... in a triangle with n terms in the n-th row; a(n) = number of deficient integers in n-th row.

1, 2, 2, 4, 4, 4, 5, 6, 7, 8, 8, 9, 9, 10, 11, 14, 13, 14, 15, 13, 16, 18, 17, 19, 18, 20, 19, 21, 23, 21, 23, 24, 24, 26, 26, 27, 29, 28, 29, 30, 31, 32, 31, 33, 36, 34, 36, 37, 35, 40, 37, 38, 40, 40, 42, 43, 43, 42, 44, 47, 45, 47, 46, 47, 50, 48, 53, 51, 53, 51, 53, 53, 58, 54

Offset

1,2

Links

Table of n, a(n) for n=1..74.

Example

Triangle begins
1 (1 deficient)
2 3 (2 deficient)
4 5 6 (2 deficient)
7 8 9 10 (4 deficient)
11 12 13 14 15 (4 deficient)
16 17 18 19 20 21 (4 deficient)
22 23 24 25 26 27 28 (5 deficient)

Crossrefs

Cf. A005100.

Sequence in context: A035660 A302405 A115367 * A144202 A157887 A292264

Adjacent sequences: A084838 A084839 A084840 * A084842 A084843 A084844

Keyword

easy,nonn

Author

Jason Earls, Jun 08 2003

Status

approved