

A214922


Numbers of the form x^2 + y^2 + z^3 + w^3 (x, y, z, w >= 0).


0



0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54
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OFFSET

1,3


COMMENTS

Conjecture: 23 is the only number not in this sequence.
Not the same as A004830: 239 is a term of this sequence but not of A004830.  R. J. Mathar and Joerg Arndt, Jul 28 2012


LINKS

Table of n, a(n) for n=1..54.


EXAMPLE

22 = 2^2 + 4^2 + 1^3 + 1^3, 22 is in this sequence.


CROSSREFS

Cf. A001481, A004999, A022549, A022550, A022551, A022552.
Sequence in context: A048242 A272076 A132264 * A004830 A081330 A080682
Adjacent sequences: A214919 A214920 A214921 * A214923 A214924 A214925


KEYWORD

nonn


AUTHOR

Philippe Deléham, Jul 20 2012


STATUS

approved



