This site is supported by donations to The OEIS Foundation.

 Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A085323 Numbers k such that both k and k+1 are sums of two positive cubes. 3
 854, 4940, 9603, 10744, 17919, 29743, 62558, 79001, 133273, 164304, 193192, 205406, 214984, 242648, 263871, 378936, 431999, 447336, 488375, 517427, 610687, 731158, 762047, 1000511, 1061550, 1125207, 1134124, 1157632, 1158137, 1179520 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS There are 664 terms < 8*10^9, a(664)=7999968373. - Zak Seidov, Jul 24 2009 This is an infinite sequence. To see why, consider the (N,N+1) pair N = 16*k^6 - 12*k^4 + 6*k^2 - 2 = (2*k^2 - k - 1)^3 + (2*k^2 + k -1)^3 and N + 1 = 16*k^6 - 12*k^4 + 6*k^2 - 1 = (2*k^2)^3 + (2*k^2 - 1)^3. - Ant King, Sep 20 2013 LINKS Zak Seidov, Table of n, a(n) for n = 1..664 EXAMPLE 854 = 9^3 + 5^3 and 855 = 8^3 + 7^3; 4940 = 17^3 + 3^3 and 4941 = 13^3 + 14^3. MATHEMATICA {m=100, k=3, m^k}; t=Union[Flatten[Table[Table[w^k+q^k, {w, 1, m}], {q, 1, m}]]]; dt=Delete[ -RotateRight[t]+t, 1]; p=Part[t, Flatten[Position[dt, 1]]]; p CROSSREFS Cf. A003325. Sequence in context: A127593 A248856 A251050 * A185639 A105275 A100969 Adjacent sequences:  A085320 A085321 A085322 * A085324 A085325 A085326 KEYWORD nonn AUTHOR Labos Elemer, Jul 01 2003 EXTENSIONS Corrected and extended by Zak Seidov, Jul 24 2009 Name and Example edited by Jon E. Schoenfield, Jul 29 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 14 02:56 EST 2018. Contains 318087 sequences. (Running on oeis4.)