The summary of a non-negative integer \$n\$ is the concatenation of all digits that appear in \$n\$ in increasing order, with each digit being preceded by the number of times it appears in \...
The background comes from this related challenge. Thanks, @HeyLlama!
The "Look and say" or "Say what you see" sequence is a series of numbers where each describes the last.
11 (one one)...