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 A047870 Smallest number that is not a sum of at most one power of each of the numbers 1 through n. 1
 1, 2, 6, 15, 53, 204, 457, 12199, 110580, 765920, 29631246, 733709898, 22329951066 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS 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 Cf. A047871. Sequence in context: A255540 A323926 A256982 * A027287 A192186 A243550 Adjacent sequences:  A047867 A047868 A047869 * A047871 A047872 A047873 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

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Last modified January 22 12:55 EST 2022. Contains 350481 sequences. (Running on oeis4.)