It started with a strange little cluster of five, coming immediately after the hundred million mark. First came 100,000,007, which was followed by 100,000,037, and 39, and 49, and finally 100,000,073. A tight little span, five numbers just sixty-six apart, out of a hundred million. The other six were more evenly spaced. Next came 188,888,881, followed by 213,161,503, and 310,248,241, and 383,838,383, and 696,729,579, and finally 999,999,937.
