Composite numbers and 1 which yield a prime whenever a 7 is inserted anywhere in them, including at the beginning or end.
A216168
Composite numbers and 1 which yield a prime whenever a 7 is inserted anywhere in them, including at the beginning or end.
Terms
- a(0) =1a(1) =9a(2) =27a(3) =33a(4) =39a(5) =57a(6) =87a(7) =159a(8) =177a(9) =187a(10) =603a(11) =717a(12) =753a(13) =949a(14) =1257a(15) =1707a(16) =2277a(17) =2367a(18) =4317a(19) =4623a(20) =4779a(21) =4797a(22) =5773a(23) =6757a(24) =6777a(25) =7017a(26) =7471a(27) =7479a(28) =7747a(29) =7797
External references
- oeis: A216168