A121215 a(1)=1. a(n) = n-th integer from among those positive integers which do not occur earlier in the sequence and which are not coprime to n.
1, 4, 9, 10, 30, 14, 56, 22, 33, 24, 143, 27, 182, 35, 48, 44, 289, 40, 361, 50, 70, 62, 529, 57, 155, 72, 105, 76, 841, 64, 1023, 96, 114, 94, 140, 84, 1369, 110, 132, 100, 1681, 90, 1849, 124, 144, 136, 2256, 112, 406, 128, 180, 154, 2809, 126, 270, 158, 204, 176
Offset: 1
Keywords
Examples
2,3,6,8,12,14,15,16,...is the sequence of positive integers which do not occur among the first 5 terms of the sequence and which are not coprime to 6. 14 is the 6th of these integers, so a(6) = 14.
Crossrefs
Cf. A105054.
Extensions
Extended by Ray Chandler, Aug 22 2006