An unexpected bonus

Claudio Meller today asked Sequence Fanatics about an extension to the sequence 1, 130, 1860, 148480, 3039520, ... So I fired up Mathematica 8 on my wife's iMac and started a search for the next term. I had indicated here on Saturday my expectation that doing so would degrade the performance of Mathematica 6 and Mathematica 7, concurrently running their respective Ruth-Aaron numbers compilations, but when I consulted the computer's Activity Monitor, I found — to my surprise, and delight — all three Mathematica kernels running at ~100%. The effect — and I wonder if it is just the appearance of a processing-power benefit — may be due to hyper-threading.