Hebdarole is a period-7 oscillator that was found by Noam Elkies in November 1997. It was originally found in the larger but more symmetric induction coil form shown below that creates 2 sparks. The smaller version shown to the right was found soon after by Alan Hensel using a component found by David Buckingham in June 1977, but that only creates one domino spark.
Its population cycles between 97, 103, 99, 111, 103, 119, and 107 cells.
The original form of hebdarole