Composite numbers k = concat(MSD(k),x) such that k' = x', where k' is the arithmetic derivative of k.

A293477

Composite numbers k = concat(MSD(k),x) such that k' = x', where k' is the arithmetic derivative of k.

Terms

    a(0) =169a(1) =1219a(2) =1339a(3) =1966a(4) =3959a(5) =7519a(6) =11569a(7) =17845a(8) =35579a(9) =37391a(10) =38579a(11) =77593a(12) =94249a(13) =94319a(14) =95299a(15) =96139a(16) =97271a(17) =97969a(18) =99691a(19) =106159a(20) =107629a(21) =115069a(22) =137533a(23) =150071a(24) =168505a(25) =188297a(26) =247589a(27) =339629a(28) =345911a(29) =352829

External references