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A247898
First differences of A247678
1
36, 36, 54, 72, 18, 36, 18, 36, 36, 36, 18, 36, 36, 18, 18, 36, 36, 54, 18, 18, 90, 36, 54, 18, 18, 18, 36, 18, 54, 18, 36, 36, 18, 18, 36, 36, 18, 36, 36, 18, 54, 18, 72, 18, 36, 54, 18, 18, 36, 18, 90, 18, 36, 36, 18, 18, 18, 18, 18, 72, 18, 36, 18, 36, 18, 18, 18, 18, 18, 18, 36, 18, 18, 18, 54, 18, 18, 18, 18, 18, 18
OFFSET
1,1
COMMENTS
All terms have digital root equal to 9.
LINKS
MATHEMATICA
Differences[Select[Range[13, 3000, 18], CompositeQ]] (* Harvey P. Dale, Aug 21 2024 *)
CROSSREFS
Cf. A247678.
Sequence in context: A255425 A126355 A217613 * A124511 A372712 A081445
KEYWORD
nonn,easy
AUTHOR
Odimar Fabeny, Sep 26 2014
STATUS
approved