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A004435 Positive integers that are not the sum of 2 distinct square integers. 5
2, 3, 6, 7, 8, 11, 12, 14, 15, 18, 19, 21, 22, 23, 24, 27, 28, 30, 31, 32, 33, 35, 38, 39, 42, 43, 44, 46, 47, 48, 51, 54, 55, 56, 57, 59, 60, 62, 63, 66, 67, 69, 70, 71, 72, 75, 76, 77, 78, 79, 83, 84, 86, 87, 88, 91 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

A025435(a(n)) = 0. - Reinhard Zumkeller, Dec 20 2013

LINKS

T. D. Noe, Table of n, a(n) for n=1..1000

Index entries for sequences related to sums of squares

MATHEMATICA

Select[Range[100], Reduce[0 <= i < j && # == i^2 + j^2, {i, j}, Integers] === False &] (* Jean-Fran├žois Alcover, Aug 01 2018 *)

PROG

(Haskell)

a004435 n = a004435_list !! (n-1)

a004435_list = [x | x <- [1..], a025435 x == 0]

-- Reinhard Zumkeller, Dec 20 2013

CROSSREFS

Cf. A001983 (complement)

Sequence in context: A175893 A031470 A047223 * A008321 A064472 A276887

Adjacent sequences:  A004432 A004433 A004434 * A004436 A004437 A004438

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 19 03:44 EST 2019. Contains 329310 sequences. (Running on oeis4.)