Number of different multisets that can be obtained by choosing a prime index (or a prime factor) of each integer from 2 to n.

A355746

Number of different multisets that can be obtained by choosing a prime index (or a prime factor) of each integer from 2 to n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =2a(8) =2a(9) =4a(10) =4a(11) =6a(12) =6a(13) =12a(14) =20a(15) =20a(16) =20a(17) =26a(18) =26a(19) =36a(20) =58a(21) =116a(22) =116a(23) =140a(24) =140a(25) =280a(26) =280a(27) =384a(28) =384a(29) =536

External references