A020623 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A020623

Smallest nonempty set S containing prime divisors of 9k+1 for each k in S.

2, 7, 13, 19, 23, 43, 59, 97

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Sequence in context: A067774 A063637 A216526 * A109346 A140550 A271114

Adjacent sequences: A020620 A020621 A020622 * A020624 A020625 A020626

KEYWORD

nonn,fini,full

AUTHOR

David W. Wilson

STATUS

approved