A376433 Number of n-digit primes in A104179.
4, 4, 8, 10, 17, 24, 46, 94, 139, 241, 416, 688, 1170, 1969, 3345, 5674, 9527, 16316, 27464, 46668, 78897, 134097, 226457, 381906, 645210, 1093472, 1843869, 3127129, 5278196
Offset: 1
Examples
a(3) = 8 because there are eight 3-digit primes {223, 233, 337, 353, 373, 523, 733, 773} that are concatenations of a 1-digit prime and a 2-digit prime that is itself a concatenation of 1-digit primes.