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A281258 Digital root of n*(n+1)*(n+2)/2. 2
0, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9, 3, 3, 3, 6, 6, 6, 9, 9, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Also zero together with period 9: repeat [3, 3, 3, 6, 6, 6, 9, 9, 9].

Also the decimal expansion of 334001/1001001.

LINKS

Table of n, a(n) for n=0..117.

FORMULA

a(n) = A010888(A027480(n)).

MATHEMATICA

PadRight[{0}, 120, {9, 3, 3, 3, 6, 6, 6, 9, 9}] (* Harvey P. Dale, Mar 22 2018 *)

CROSSREFS

Cf. A010888, A027480.

Sequence in context: A073080 A171601 A057944 * A080607 A013322 A211534

Adjacent sequences:  A281255 A281256 A281257 * A281259 A281260 A281261

KEYWORD

nonn,base

AUTHOR

Peter M. Chema, Jan 18 2017

STATUS

approved

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Last modified February 16 21:59 EST 2019. Contains 320200 sequences. (Running on oeis4.)