Group the composite numbers so that the sum of the n-th group is a multiple of the n-th prime: (4), (6), (8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22), (24, 25), (26, 27, 28, 30, 32), (33, 34, ...), ... Sequence gives the first term of each group.
A074125
Group the composite numbers so that the sum of the n-th group is a multiple of the n-th prime: (4), (6), (8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22), (24, 25), (26, 27, 28, 30, 32), (33, 34, ...), ... Sequence gives the first term of each group.
Terms
- a(0) =4a(1) =6a(2) =8a(3) =24a(4) =26a(5) =33a(6) =60a(7) =77a(8) =99a(9) =165a(10) =187a(11) =209a(12) =219a(13) =261a(14) =336a(15) =464a(16) =470a(17) =475a(18) =482a(19) =558a(20) =865a(21) =955a(22) =973a(23) =984a(24) =1106a(25) =1314a(26) =1424a(27) =1466a(28) =1492a(29) =1572
External references
- oeis: A074125