Consider a number of k digits n = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + ... + d_(2)*10 + d_(1). Sequence lists the numbers n such that n' = Sum_{i=1..k-1}{Sum_{j=1..i}{d_(j)*10^(j-1)}}', where n' is the arithmetic derivative of n (see example below).
A244078
Consider a number of k digits n = d_(k)*10^(k-1) + d_(k-1)*10^(k-2) + ... + d_(2)*10 + d_(1). Sequence lists the numbers n such that n' = Sum_{i=1..k-1}{Sum_{j=1..i}{d_(j)*10^(j-1)}}', where n' is the arithmetic derivative of n (see example below).
Terms
- a(0) =13a(1) =17a(2) =23a(3) =37a(4) =43a(5) =53a(6) =67a(7) =73a(8) =83a(9) =97a(10) =131a(11) =211a(12) =241a(13) =271a(14) =311a(15) =331a(16) =431a(17) =461a(18) =541a(19) =571a(20) =631a(21) =641a(22) =661a(23) =761a(24) =811a(25) =911a(26) =941a(27) =971a(28) =1601a(29) =3701
External references
- oeis: A244078