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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
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified May 30 23:56 EDT 2020. Contains 334747 sequences. (Running on oeis4.)