a(n) is the position of 7^n among the powers of primes (A000961).
A025472
a(n) is the position of 7^n among the powers of primes (A000961).
Terms
- a(0) =1a(1) =6a(2) =24a(3) =87a(4) =393a(5) =2002a(6) =11212a(7) =65907a(8) =398221a(9) =2454882a(10) =15355483a(11) =97168563a(12) =620657849a(13) =3995177593a(14) =25885249943a(15) =168651040452
External references
- oeis: A025472