1,2

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

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)

Cf. A005100.

Sequence in context: A035660 A302405 A115367 * A144202 A157887 A292264

Adjacent sequences: A084838 A084839 A084840 * A084842 A084843 A084844

easy,nonn

Jason Earls, Jun 08 2003

approved