Composite numbers m such that m'' = m'-1, where m' and m'' are the first and the second arithmetic derivatives of m.

A189803

Composite numbers m such that m'' = m'-1, where m' and m'' are the first and the second arithmetic derivatives of m.

Terms

    a(0) =9a(1) =185a(2) =341a(3) =377a(4) =437a(5) =9005a(6) =30413a(7) =33953a(8) =41009a(9) =51533a(10) =82673a(11) =92909a(12) =103073a(13) =126509a(14) =143009a(15) =165773a(16) =181793a(17) =184973a(18) =191309a(19) =228653a(20) =231713a(21) =246893a(22) =291233a(23) =311309a(24) =316973a(25) =319793a(26) =329357a(27) =353009a(28) =358433a(29) =374513

External references