SEVEN-DIAGONAL PATTERN IN AN OCTAL (BASE 8) NUMERAL SYSTEM - (UNDERLINES ARE NOT HYPERLINKS)

0	1	2	3	4	5	6	7
10	11	12	13	14	15	16	17
20	21	22	23	24	25	26	27
30	31	32	33	34	35	36	37
40	41	42	43	44	45	46	47
50	51	52	53	54	55	56	57
60	61	62	63	64	65	66	67
70	71	72	73	74	75	76	77

NOTICE HOW THE DIGITS OF SEVEN-MULTIPLES (ABOVE) ADD TO SEVEN, JUST AS THOSE OF NINE-MULTIPLES ADD TO NINE IN DECIMAL SYSTEM. THIS INDUCES A "CASTING OUT SEVENS" ALGORITHM IN THE OCTAL (BASE EIGHT) NUMERAL SYSTEM. ACTIVITHM, YEA!