Sorry, I got it backwards, I was reading the OEIS numbers too fast. It's the other way around: transits sometimes do not occur in pairs: 1275, 1283, 1396, 1518, 1526, ... note the 1396 but no 1388 or 1404. This is why I don't help out with the OEIS more often (-: There's something else odd going on, because the prior solo transit was in 910, but the next one won't be until 3089. That Fred Espenak webpage [3] sort of explains it. On 6/5/12, Robert Munafo <mrob27@gmail.com> wrote:
On 6/5/12, Huddleston, Scott <scott.huddleston@intel.com> wrote:
Do Venus transits ever occur in triples?
Yes, the last triple was in 1275, 1283, and 1396 according to Fred Espenak [1]. OEIS sequence A171467 [2] gives a list of transit years. [...] [2] http://oeis.org/A171467 [3] http://eclipse.gsfc.nasa.gov/transit/catalog/VenusCatalog.html
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