Composite numbers k, not squarefree semiprimes, such that k' is a sum of distinct primorial numbers, where k' stands for the arithmetic derivative of k, A003415.

A369642

Composite numbers k, not squarefree semiprimes, such that k' is a sum of distinct primorial numbers, where k' stands for the arithmetic derivative of k, A003415.

Terms

    a(0) =9a(1) =16a(2) =28a(3) =30a(4) =45a(5) =108a(6) =112a(7) =136a(8) =189a(9) =198a(10) =210a(11) =212a(12) =225a(13) =236a(14) =244a(15) =246a(16) =282a(17) =290a(18) =361a(19) =374a(20) =399a(21) =435a(22) =507a(23) =1480a(24) =1940a(25) =2132a(26) =2212a(27) =2308a(28) =2356a(29) =2524

External references