a(n) is the least positive exponent k such that the decimal expansion of 7^k contains n consecutive zeros.
A329174
a(n) is the least positive exponent k such that the decimal expansion of 7^k contains n consecutive zeros.
Terms
- a(0) =1a(1) =4a(2) =20a(3) =74a(4) =154a(5) =499a(6) =510a(7) =4411a(8) =6984a(9) =33836a(10) =61282a(11) =709339a(12) =1570651
External references
- oeis: A329174