Odd k for which abs(2^m - k) is nonprime for all m < k.

Terms

a(0) =1a(1) =337a(2) =2293a(3) =4327a(4) =6247a(5) =6269a(6) =12749a(7) =13603a(8) =14023a(9) =14347a(10) =14407a(11) =15997a(12) =21673a(13) =25229a(14) =31511a(15) =36971a(16) =47107a(17) =48703a(18) =48959a(19) =50171a(20) =56351a(21) =59399a(22) =63389a(23) =69427a(24) =83381a(25) =84491a(26) =85061a(27) =104549a(28) =107857a(29) =109649