A247900 First differences of A247681.

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

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