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