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A020623 Smallest nonempty set S containing prime divisors of 9k+1 for each k in S. +0
1
2, 7, 13, 19, 23, 43, 59, 97 (list; graph; listen)
OFFSET

1,1
CROSSREFS

Sequence in context: A007821 A067774 A063637 this_sequence A109346 A138646 A118755

Adjacent sequences: A020620 A020621 A020622 this_sequence A020624 A020625 A020626

KEYWORD

nonn,fini,full

AUTHOR

David W. Wilson (davidwwilson(AT)comcast.net)

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Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

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