Period-5 oscillators with up to 21 cells

This page is intended as an editable, up-to-date partial replacement for Mark Niemiec's page on period-5 oscillators with syntheses (https://conwaylife.com/ref/mniemiec/p5.htm).

15 to 16 cells

Main article: List of oscillators with 3 to 16 cells

Population	Oscillator		apgcode	Frequency class	Cost in gliders
15		Pseudo-barberpole	xp5_y2g0k413zwo0a02z32	[No natural occurrences]	9
16		Octagon 2	xp5_idiidiz01w1	29.3	5

17 cells

	Oscillator		apgcode	Frequency class	Cost in gliders
1		Silver's p5 on aircraft carrier	xp5_wftsw628cz32	45.4	10
N/A		Silver's p5 on snake	xp5_wftsw6246z32	[No natural occurrences]	10

18 cells

	Oscillator		apgcode	Frequency class	Cost in gliders
1		Fumarole	xp5_3pmwmp3zx11	35.8	7
2		Silver's p5 on eater tail	xp5_w6qgwc453z65w1	48	8
3		Silver's p5 on eater head	xp5_wftsw62sgz32	unknown	8
N/A		Silver's p5 on long snake	xp5_wftsw6248cz32	[No natural occurrences]	10

19 cells

	Oscillator		apgcode	Frequency class	Cost in gliders
?		tub fumarole	xp5_035426oz4a5123	44.6	9
?		Silver's p5 on very long snake	xp5_wftsw6248goz32	unnatural	10
?		Silver's p5 on canoe	xp5_0312kozwcssgoz32	unnatural	10
?		Silver's p5 on shillelagh	xp5_wftsw62453z32	unknown	10
?		Silver's p5 behind shillelagh	xp5_w6qgwmp3z65w1	unknown	10
?		Silver's p5 on hook-with-tail hook	xp5_w6qgwc4871z65w1	unnatural	10
?		Silver's p5 on hook-with-tail tail	xp5_wckxo8b5zca013	unnatural	10
?		Silver's p5 on tub with tail	xp5_wckxo8a52zca013	unnatural	10