A345419 - OEIS

A345419

Row 2 of array in A345417.

1, 0, 2, -2, 4, -4, 6, -6, 8, 10, -10, -12, 14, -14, 16, 18, 20, -20, -22, 24, -24, -26, 28, 30, -32, 34, -34, 36, -36, 38, -42, 44, 46, -46, 50, -50, -52, -54, 56, 58, 60, -60, 64, -64, 66, -66, -70, -74, 76, -76, 78, 80, -80, 84, 86, 88, 90, -90, -92, 94, -94, 98, -102, 104, -104

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OFFSET

1,3

LINKS

Table of n, a(n) for n=1..65.

PROG

(Python)

from sympy.core.numbers import igcdex

from sympy import prime

def A345419(n): return igcdex(3, prime(n))[0] # Chai Wah Wu, Jul 01 2021

CROSSREFS

Cf. A345417-A345422.