A368825 a(1) = 1; for n > 1, a(n) = A055231(a(n-1) + n), where A055231(k) is the powerfree part of k.
1, 3, 6, 10, 15, 21, 7, 15, 3, 13, 3, 15, 7, 21, 1, 17, 34, 13, 1, 21, 42, 1, 3, 1, 26, 13, 5, 33, 62, 23, 2, 34, 67, 101, 17, 53, 10, 3, 42, 82, 123, 165, 13, 57, 102, 37, 21, 69, 118, 21, 1, 53, 106, 5, 15, 71, 1, 59, 118, 178, 239, 301, 91, 155, 55, 1, 17, 85, 154, 7, 78, 6, 79, 17, 23, 11
Offset: 1
Keywords
Examples
a(9) = 3 as a(8)+9 = 15+9 = 24 = 2*2*2*3, and the powerfree part of 24 is 3.
Links
- Scott R. Shannon, Table of n, a(n) for n = 1..10000
- Scott R. Shannon, Image of the first 1000000 terms. The green line is a(n) = n.
Comments