A105340 - OEIS

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A105340

a(n) = n*(n+1)/2 mod 2048.

1

0, 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 300, 325, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666, 703, 741, 780, 820, 861, 903, 946, 990, 1035, 1081, 1128, 1176, 1225, 1275, 1326, 1378, 1431, 1485, 1540, 1596, 1653, 1711, 1770, 1830, 1891, 1953, 2016, 32

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

COMMENTS

Period 4096. - Charles R Greathouse IV, Oct 16 2012

LINKS

Table of n, a(n) for n=0..64.

MATHEMATICA

Mod[Accumulate[Range[0, 70]], 2048] (* Harvey P. Dale, Sep 18 2019 *)

PROG

(PARI) a(n)=n*(n+1)/2%2048 \\ Charles R Greathouse IV, Oct 16 2012

CROSSREFS

See A105198 for further information.

Sequence in context: A161680 A000217 A179865 * A176659 A109811 A025747

Adjacent sequences: A105337 A105338 A105339 * A105341 A105342 A105343

KEYWORD

nonn,easy

AUTHOR

Oscar Takeshita, May 01 2005

EXTENSIONS

Removed formulas that were wrong at indices >= 65 because the "mod 2048" part of the definition had been ignored R. J. Mathar, Jan 26 2010

STATUS

approved