Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 3 and repeat; as m = 1,2,3,.. the remaining terms form this sequence.

A112561

Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 3 and repeat; as m = 1,2,3,.. the remaining terms form this sequence.

Terms

    a(0) =1a(1) =5a(2) =21a(3) =61a(4) =125a(5) =261a(6) =421a(7) =605a(8) =1101a(9) =1681a(10) =2525a(11) =2781a(12) =4201a(13) =5645a(14) =6741a(15) =9541a(16) =11765a(17) =13701a(18) =17641a(19) =21305a(20) =27981a(21) =29401a(22) =37265a(23) =43521a(24) =51541a(25) =59945a(26) =65781a(27) =78121a(28) =89345a(29) =99981

External references