Composite numbers m such that (m'+1)' = m', where m' = A003415(m) is the arithmetic derivative of m.

A185222

Composite numbers m such that (m'+1)' = m', where m' = A003415(m) is the arithmetic derivative of m.

Terms

    a(0) =6a(1) =42a(2) =1806a(3) =2786a(4) =47058a(5) =73178a(6) =85082a(7) =2143066830a(8) =2214502422a(9) =3138798830a(10) =4404051298a(11) =4428107218a(12) =4428595298a(13) =52495396602a(14) =62994475914a(15) =76852598955a(16) =104971651322

External references