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A247900 First differences of A247681. 2
54, 36, 54, 72, 18, 18, 36, 36, 18, 18, 54, 36, 18, 36, 54, 36, 54, 18, 18, 18, 18, 54, 18, 54, 18, 36, 54, 18, 54, 18, 36, 18, 36, 54, 18, 18, 18, 18, 54, 18, 18, 18, 18, 18, 36, 36, 18, 18, 72, 18, 36, 36, 36, 18, 36, 54, 18, 18, 36, 18, 18, 18, 18, 18, 54, 36, 36, 18, 72, 18, 18, 72, 18, 36, 36, 18, 18, 18, 36, 90 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms have digital root equal to 9.

LINKS

Odimar Fabeny, Table of n, a(n) for n = 1..9999 [first term removed by Georg Fischer, Sep 02 2020]

MATHEMATICA

Differences[Select[Range[1, 3500, 18], !PrimeQ[#]&]] (* Harvey P. Dale, Apr 25 2018 *)

CROSSREFS

Cf. A247681.

Sequence in context: A137939 A033374 A247897 * A116386 A107936 A252722

Adjacent sequences:  A247897 A247898 A247899 * A247901 A247902 A247903

KEYWORD

nonn,easy

AUTHOR

Odimar Fabeny, Sep 26 2014

EXTENSIONS

First term 54 removed by Georg Fischer, Sep 02 2020

STATUS

approved

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Last modified September 26 05:53 EDT 2022. Contains 356986 sequences. (Running on oeis4.)