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

1,2

Links

Table of n, a(n) for n=1..58.

Example

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.

Sequence in context: A113434 A236024 A141395 * A178224 A102985 A112401

Adjacent sequences: A121212 A121213 A121214 * A121216 A121217 A121218

Keyword

nonn

Author

Leroy Quet, Aug 20 2006

Extensions

Extended by Ray Chandler, Aug 22 2006

Status

approved