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Number of n-digit primes in A104179.
3

%I #9 Sep 23 2024 13:46:20

%S 4,4,8,10,17,24,46,94,139,241,416,688,1170,1969,3345,5674,9527,16316,

%T 27464,46668,78897,134097,226457,381906,645210,1093472,1843869,

%U 3127129,5278196

%N Number of n-digit primes in A104179.

%e 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.

%Y Cf. A104179, A376434, A376435.

%K nonn,base,more

%O 1,1

%A _Karl W. Heuer_, Sep 22 2024