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A287895 Differences of A287894. 1
4, 13, 12, 3, 61, 42, 50, 39, 43, 80, 65, 89, 180, 110, 146, 160, 156, 187, 88, 118, 258, 243, 244, 282, 287, 189, 343, 311, 203, 410, 219, 467, 473, 274, 384, 535, 406, 484, 54, 825, 310, 558, 551, 375, 886, 659, 539, 515, 294, 914, 764, 478, 774, 757, 823 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The first two negative terms are a(99) = -239 and a(999) = -5966. - Giovanni Resta, Jun 07 2017

LINKS

Robert Israel, Table of n, a(n) for n = 1..1000

EXAMPLE

Take the differences of 1,5,18,30,... => 4,13,12,...

MAPLE

ds:= n -> convert(convert(n, base, 10), `+`):

f:= n -> add(ds(k^n), k=1..n):

A287894:= map(f, [$1..101]);

A287894[2..101] - A287894[1..100]; # Robert Israel, Jun 30 2017

MATHEMATICA

s[n_] := Sum[Total@IntegerDigits[k^n], {k, n}]; Differences@ Array[s, 60] (* Giovanni Resta, Jun 07 2017 *)

CROSSREFS

Cf. A287894.

Sequence in context: A173800 A175174 A136137 * A050223 A301792 A168401

Adjacent sequences:  A287892 A287893 A287894 * A287896 A287897 A287898

KEYWORD

sign,base

AUTHOR

Marian Kraus, Jun 02 2017

STATUS

approved

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Last modified April 25 13:31 EDT 2019. Contains 322461 sequences. (Running on oeis4.)