Numbers p_1*p_2*...*p_k such that (2^p_1-1)*(2^p_2-1)*...*(2^p_k-1) is a Poulet number (A001567), where p_i are primes and k >= 2.
A291617
Numbers p_1*p_2*...*p_k such that (2^p_1-1)*(2^p_2-1)*...*(2^p_k-1) is a Poulet number (A001567), where p_i are primes and k >= 2.
Terms
- a(0) =230a(1) =341a(2) =1387a(3) =2047a(4) =2701a(5) =3277a(6) =4033a(7) =4369a(8) =4681a(9) =5461a(10) =7957a(11) =8321a(12) =10261a(13) =13747a(14) =14491a(15) =15709a(16) =18721a(17) =19951a(18) =23377a(19) =31323a(20) =31417a(21) =31609a(22) =31621a(23) =35333a(24) =38193a(25) =42799a(26) =49141a(27) =49981a(28) =60701a(29) =60787
External references
- oeis: A291617