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A055041 Numbers of the form 3^(2i+1)*(3*j+1). 0
3, 12, 21, 27, 30, 39, 48, 57, 66, 75, 84, 93, 102, 108, 111, 120, 129, 138, 147, 156, 165, 174, 183, 189, 192, 201, 210, 219, 228, 237, 243, 246, 255, 264, 270, 273, 282, 291, 300, 309, 318, 327, 336, 345, 351, 354, 363, 372, 381, 390, 399 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The numbers not of the form x^2+y^2+6z^2.

REFERENCES

L. J. Mordell, A new Waring's problem with squares of linear forms, Quart. J. Math., 1 (1930), 276-288 (see p. 283).

LINKS

Table of n, a(n) for n=1..51.

CROSSREFS

Sequence in context: A080767 A043465 A074276 * A061819 A017197 A051369

Adjacent sequences:  A055038 A055039 A055040 * A055042 A055043 A055044

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Jun 01 2000

STATUS

approved

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Last modified November 12 19:33 EST 2019. Contains 329078 sequences. (Running on oeis4.)