the.com/look and say sequence
a number that describes itself out loud, then never shuts up.
means a sequence where each term is generated by reading the previous term aloud, digit by digit, describing counts of consecutive same digits.
from popularized by john conway in the 1980s, who analyzed it so thoroughly he derived a constant, the conway constant, describing how fast it grows.
growth rateterms grow by about 30 percent in length each step
conway constantratio of term lengths converges to 1.303577...
no foursthe digit 4 never appears if you start from 1
self-describingonly sequence where each term literally narrates the last
for instance
conway's cosmological theorem — proves every sequence eventually splits into 92 elemental substrings
atomic elements naming — conway named the 92 building blocks after chemical elements