Odd numbers n not congruent to 1 mod 6 and that are not perfect powers such that for all k >= 1 the numbers n*4^k - 1 are composite.
A251757
Odd numbers n not congruent to 1 mod 6 and that are not perfect powers such that for all k >= 1 the numbers n*4^k - 1 are composite.
Terms
- a(0) =39939a(1) =656709a(2) =762701a(3) =777149a(4) =779619a(5) =790841a(6) =869859a(7) =1106681a(8) =1156299a(9) =1254341a(10) =1320981a(11) =1330319a(12) =1730681a(13) =2251349a(14) =2344211a(15) =2882541a(16) =2924861a(17) =3079469a(18) =3292241a(19) =3419789a(20) =3580901a(21) =3661529a(22) =3781541a(23) =3784439a(24) =3848289a(25) =4358481a(26) =4384979a(27) =4507889a(28) =4524549
External references
- oeis: A251757