

A228499


Sums of two rational cubes, excluding cubes and twice cubes.


0



6, 7, 9, 12, 13, 15, 17, 19, 20, 22, 26, 28, 30, 31, 33, 34, 35, 37, 42, 43, 48, 49, 50, 51, 53, 56, 58, 61, 62, 63, 65, 67, 68, 69, 70, 71, 72, 75, 78, 79, 84, 85, 86, 87, 89, 90, 91, 92, 94, 96, 97, 98, 103, 104, 105, 106, 107, 110, 114, 115, 117, 120, 123, 124
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OFFSET

1,1


COMMENTS

Each term can be written as sum of two rational cubes infinitely many times.


REFERENCES

Wacław Sierpiński, Teoria liczb, cz. II, PWN, Warsaw, 1959, pp. 472473.


LINKS

Table of n, a(n) for n=1..64.
Index entries for sequences related to sums of cubes


PROG

(PARI) for(n=1, 124, if(ellanalyticrank(ellinit([0, (4*n)^2]))[1]>0, print1(n, ", ")));


CROSSREFS

Cf. A020898. Subsequence of A159843.
Sequence in context: A095908 A094698 A096405 * A108595 A186079 A022938
Adjacent sequences: A228496 A228497 A228498 * A228500 A228501 A228502


KEYWORD

nonn


AUTHOR

Arkadiusz Wesolowski, Aug 23 2013


STATUS

approved



