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A033465 First differences of sequence {1/(n^2+1)} (numerators). 0
1, 3, 1, 7, 9, 11, 13, 3, 17, 19, 21, 23, 1, 27, 29, 31, 33, 7, 37, 39, 41, 43, 9, 47, 49, 51, 53, 11, 57, 59, 61, 63, 13, 67, 69, 71, 73, 3, 77, 79, 81, 83, 17, 87, 89, 91, 93, 19, 97, 99, 101, 103, 21, 107, 109, 111, 113 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..56.

MATHEMATICA

Numerator[Abs[Differences[1/(Range[0, 60]^2+1)]]] (* Harvey P. Dale, May 01 2013 *)

CROSSREFS

Sequence in context: A087129 A286436 A011308 * A096431 A171501 A280332

Adjacent sequences:  A033462 A033463 A033464 * A033466 A033467 A033468

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 25 08:17 EST 2021. Contains 341596 sequences. (Running on oeis4.)