The products k of two distinct primes such that 2*k-1, 4*k-3, 8*k-7, 16*k-15, 32*k-31, 64*k-63, 128*k-127 and 256*k-255 are also products of two distinct primes.
A177217
The products k of two distinct primes such that 2*k-1, 4*k-3, 8*k-7, 16*k-15, 32*k-31, 64*k-63, 128*k-127 and 256*k-255 are also products of two distinct primes.
Terms
- a(0) =31261a(1) =36199a(2) =44869a(3) =49471a(4) =62521a(5) =72397a(6) =83086a(7) =138994a(8) =173311a(9) =182527a(10) =224962a(11) =259891a(12) =277987a(13) =346621a(14) =370126a(15) =415423a(16) =443746a(17) =464245a(18) =480331a(19) =519781a(20) =544006a(21) =563326a(22) =599245a(23) =693241a(24) =784681a(25) =880561a(26) =928489a(27) =980743a(28) =991237a(29) =1032937
External references
- oeis: A177217