OFFSET
0,2
EXAMPLE
a(2)=6 because 6 is the first number that is not of the form 1+2^i, 2^i or 1; a(3)=15 because 15 is smallest number not of form 1^i+2^j+3^k where i,j,k = -infinity or >=0.
The old value for a(11), 436070111, was not correct since 436070111 = 1 + 2^26 + 3^7 + 4^2 + 5^8 + 6^11 + 7^8 + 9^4. - Donovan Johnson, Oct 09 2009
CROSSREFS
KEYWORD
nonn,more,nice
AUTHOR
Nathan M. Simpson (ntsimp(AT)concentric.net)
EXTENSIONS
Corrected and extended by David W. Wilson
Two more terms from Don Reble, Oct 26 2001
a(11) corrected by Donovan Johnson, Oct 08 2009
a(12) from Donovan Johnson, Jul 22 2010
STATUS
approved