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A226484 Odd numbers not of the form p + q^2 + r^3 with p, q, and r prime. 2
1, 3, 5, 7, 9, 11, 13, 21, 27, 33, 37, 45, 51, 61, 127, 351 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

There are no more terms < 10^11.

LINKS

Table of n, a(n) for n=1..16.

MATHEMATICA

pp[n_] := Prime@ Range@ PrimePi@ n; upto[n_] := Complement[Range[1, n, 2],

  Flatten@Table[ q^2 + r^3 + pp[n - q^2 - r^3], {r, pp[n^(1/3)]}, {q, pp@Sqrt[n - r^3]}]]; upto[10^4]

CROSSREFS

Cf. A212292.

Sequence in context: A291343 A030155 A143448 * A261213 A130738 A239036

Adjacent sequences:  A226481 A226482 A226483 * A226485 A226486 A226487

KEYWORD

nonn,hard,more

AUTHOR

Giovanni Resta, Jun 09 2013

STATUS

approved

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Last modified October 16 15:51 EDT 2019. Contains 328101 sequences. (Running on oeis4.)