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A345419 Row 2 of array in A345417. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
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
Sequence in context: A137501 A308767 A353504 * A285999 A005186 A259881
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Jun 19 2021
STATUS
approved

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Last modified March 28 10:55 EDT 2024. Contains 371241 sequences. (Running on oeis4.)