OFFSET
1,1
COMMENTS
The numbers not of the form x^2+y^2+4z^2.
Positions of 3 in A065882. - Clark Kimberling, Oct 19 2016
The asymptotic density of this sequence is 1/3. - Amiram Eldar, Mar 08 2021
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..10000
M. A. Bennett and B. Reznick, Positive rational solutions to x^y = y^{mx}: : A Number-Theoretic Excursion, Amer. Math. Monthly, 111 (No. 1, 2004), 13-21.
L. J. Mordell, A new Waring's problem with squares of linear forms, Quart. J. Math., 1 (1930), 276-288 (see p. 283).
MATHEMATICA
t = Table[Mod[n/4^IntegerExponent[n, 4], 4], {n, 1, 160}] (*A065882*)
Flatten[Position[t, 3]] (*A055050*) (* Clark Kimberling, Oct 19 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jun 02 2000
STATUS
approved