Number of primes of the form (x+1)^7 - x^7 having n digits.

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =1a(6) =3a(7) =1a(8) =1a(9) =2a(10) =4a(11) =4a(12) =7a(13) =9a(14) =12a(15) =14a(16) =29a(17) =31a(18) =45a(19) =62a(20) =71a(21) =117a(22) =175a(23) =231a(24) =331a(25) =454a(26) =634a(27) =948a(28) =1250a(29) =1770