A376433
Number of n-digit primes in A104179.
Original entry on oeis.org
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
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.
Original entry on oeis.org
2, 23, 223, 2237, 23333, 223337, 2233373, 22323337, 222335353, 2232333533, 22323332323, 222335353337, 2223337223773, 22233372237737, 222322375373773, 2223223753737733, 22232232373337353, 222237322353237223, 2222327532332333737, 22223353533353323333
Offset: 1
a(3) = 223 because 223 is the smallest 3-digit prime that is a concatenation of a 1-digit prime and a 2-digit prime that is itself a concatenation of 1-digit primes.
Original entry on oeis.org
7, 73, 773, 7523, 77323, 753773, 7732337, 77323733, 773337223, 7773337223, 77735235323, 777352335323, 7773232237523, 77733372233533, 777352353232333, 7773733335332333, 77737523727333737, 777733372232237537, 7777352335323753353, 77773733335332333773
Offset: 1
a(3) = 773 because 773 is the largest 3-digit prime that is a concatenation of a 1-digit prime and a 2-digit prime that is itself a concatenation of 1-digit primes.
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