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A135462 a(n) = number of Eisenstein primes (see A055664) of norm <= n. 4
0, 0, 0, 6, 12, 12, 12, 24, 24, 24, 24, 24, 24, 36, 36, 36, 36, 36, 36, 48, 48, 48, 48, 48, 48, 54, 54, 54, 54, 54, 54, 66, 66, 66, 66, 66, 66, 78, 78, 78, 78, 78, 78, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 90, 102, 102, 102, 102, 102 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,4
REFERENCES
L. W. Reid, The Elements of the Theory of Algebraic Numbers, MacMillan, NY, 1910, see Chap. VI.
LINKS
FORMULA
a(n) = a(n-1) + A055667(n) for n > 0. - Seiichi Manyama, Dec 09 2017
MATHEMATICA
A055667[n_] := Which[n == 3, 6, PrimeQ[n] && Mod[n, 6] == 1, 12, PrimeQ[p = Sqrt[n]] && Mod[p, 3] == 2, 6, True, 0]; Accumulate[Array[A055667, 66, 0]] (* Jean-François Alcover, Feb 28 2018 *)
CROSSREFS
Sequence in context: A315570 A353997 A315571 * A315572 A218289 A156386
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 06 2008
EXTENSIONS
Terms corrected by Seiichi Manyama, Dec 09 2017
STATUS
approved

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Last modified December 5 05:37 EST 2023. Contains 367575 sequences. (Running on oeis4.)