A080740 a(n) = number of m such that A080737(m) <= 2n.

2, 5, 9, 17, 24, 35, 48, 62, 82, 108, 138, 180, 223, 272, 336, 401, 483, 578, 685, 814, 957, 1113, 1299, 1502, 1737, 2004, 2299, 2633, 3005, 3420, 3886, 4400, 4981, 5618, 6325, 7108, 7967, 8927, 9982, 11134, 12415, 13805, 15327, 17006, 18830, 20841

Offset: 0

Author

N. J. A. Sloane, Mar 08 2003

Keywords

• nonn
• easy

Comments

Total number of elements in first n rows of A080738.

Links

• J. Bamberg, G. Cairns and D. Kilminster, The crystallographic restriction, permutations and Goldbach's conjecture, Amer. Math. Monthly, 110 (March 2003), 202-209.

Crossrefs

Partial sums of A080739.

Programs

Haskell

a080740 n k = a080740_list !! n
a080740_list = scanl1 (+) a080739_list  -- Reinhard Zumkeller, Jun 13 2012

Extensions

More terms from Devin Kilminster (devin(AT)maths.uwa.edu.au), Mar 10 2003