An irregular array read by rows. The k-th entry of row r is the number of r-digit primes with digit sum k.
A178701
An irregular array read by rows. The k-th entry of row r is the number of r-digit primes with digit sum k.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =0a(5) =1a(6) =2a(7) =2a(8) =2a(9) =3a(10) =3a(11) =3a(12) =1a(13) =1a(14) =2a(15) =1a(16) =1a(17) =2a(18) =4a(19) =7a(20) =7a(21) =12a(22) =13a(23) =16a(24) =16a(25) =13a(26) =18a(27) =12a(28) =11a(29) =6
External references
- oeis: A178701