0,2

Table of n, a(n) for n=0..13.

a(2)=4 because 4 is the first number >2 that is not of the form 1^i+2^j; a(3)=7 because 7 is smallest number >4 not of form 1^i+2^j+3^k.

Cf. A047870.

Sequence in context: A026775 A027238 A076894 * A103032 A215649 A259351

Adjacent sequences: A047868 A047869 A047870 * A047872 A047873 A047874

nonn,nice

N. J. A. Sloane

More terms from _David W. Wilson

Two more terms from Don Reble (djr(AT)nk.ca), Oct 27 2001

a(12) from Donovan Johnson, Oct 07 2009

a(13) from Donovan Johnson, Jul 26 2010

approved