Some of these are in pairs that are 4 years = 3 yerms apart. The pair of 20-34 and 20-37 almost forms a triplet, but 20-31 which occurs on 1967-10-04 is a Wednesday which is not allowed to be a Hebrew new year.
If a triplet does exist then,
its days of the week must be (Saturday, Thursday, Tuesday) or (Monday, Saturday, Thursday) and
its Hebrew year numbers must have remainders of (9,13,17) when divided by 19.