a(1)=1. a(n) = the smallest integer > a(n-1) that is an (odd) palindrome when written in binary, and is such that (a(n)-a(n-1))/2 is prime.
A161536
a(1)=1. a(n) = the smallest integer > a(n-1) that is an (odd) palindrome when written in binary, and is such that (a(n)-a(n-1))/2 is prime.
Terms
- a(0) =1a(1) =5a(2) =9a(3) =15a(4) =21a(5) =27a(6) =31a(7) =45a(8) =51a(9) =65a(10) =99a(11) =257a(12) =403a(13) =561a(14) =1675a(15) =2289a(16) =6731a(17) =8385a(18) =24707a(19) =34209a(20) =98947a(21) =131073a(22) =394499a(23) =526593a(24) =1577219a(25) =2097153a(26) =6298627a(27) =8394753a(28) =25197571a(29) =33554433
External references
- oeis: A161536