a(n) is the first number k with n prime divisors such that, if m is the next number with n prime divisors, k + m and k - m also have n prime divisors. In each case the divisors are counted with multiplicity.
A365834
a(n) is the first number k with n prime divisors such that, if m is the next number with n prime divisors, k + m and k - m also have n prime divisors. In each case the divisors are counted with multiplicity.
Terms
- a(0) =51a(1) =130a(2) =260a(3) =520a(4) =1040a(5) =3120a(6) =21440a(7) =42880a(8) =85760a(9) =171520a(10) =343040a(11) =686080a(12) =1372160a(13) =2744320a(14) =5488640a(15) =10977280a(16) =21954560a(17) =43909120a(18) =87818240a(19) =175636480a(20) =351272960a(21) =702545920a(22) =1405091840a(23) =2810183680a(24) =5620367360a(25) =11240734720a(26) =22481469440a(27) =44962938880a(28) =89925877760a(29) =179851755520
External references
- oeis: A365834