Numbers a(n) are obtained by the direct application of sieve of Eratosthenes for A000695: retaining A000695(2)=4, we delete all multiples of 4, which are more than 4; retaining A000695(3)=5, we delete all multiples of 5, which are more than 5, etc.

A152021

Numbers a(n) are obtained by the direct application of sieve of Eratosthenes for A000695: retaining A000695(2)=4, we delete all multiples of 4, which are more than 4; retaining A000695(3)=5, we delete all multiples of 5, which are more than 5, etc.

Terms

    a(0) =4a(1) =5a(2) =17a(3) =21a(4) =69a(5) =81a(6) =257a(7) =261a(8) =277a(9) =321a(10) =337a(11) =341a(12) =1041a(13) =1089a(14) =1093a(15) =1109a(16) =1297a(17) =1301a(18) =1349a(19) =1361a(20) =4101a(21) =4113a(22) =4117a(23) =4161a(24) =4177a(25) =4181a(26) =4353a(27) =4357a(28) =4373a(29) =4417

External references