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A135461 a(n) = 1 if n is the norm of an Eisenstein prime (see A055664) otherwise 0. 4
0, 0, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

REFERENCES

L. W. Reid, The Elements of the Theory of Algebraic Numbers, MacMillan, NY, 1910, see Chap. VI.

LINKS

Antti Karttunen, Table of n, a(n) for n = 0..65537

Index entries for characteristic functions

EXAMPLE

The smallest primes are 1-omega (of norm 3) and 2 (of norm 4).

PROG

(PARI) A135461(n) = (isprime(n) && n%3<2) || (issquare(n, &n) && isprime(n) && n%3==2); \\ This is Charles R Greathouse IV's Apr 30 2013 code (with name "is") for A055664. - Antti Karttunen, Dec 06 2017

CROSSREFS

Cf. A055667, A135462.

Characteristic function of A055664.

Sequence in context: A179827 A285133 A011658 * A327219 A274950 A093383

Adjacent sequences:  A135458 A135459 A135460 * A135462 A135463 A135464

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Feb 06 2008

STATUS

approved

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Last modified August 16 07:50 EDT 2022. Contains 356160 sequences. (Running on oeis4.)