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A020623 Smallest nonempty set S containing prime divisors of 9k+1 for each k in S. 0
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

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Last modified June 21 16:42 EDT 2021. Contains 345365 sequences. (Running on oeis4.)