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A004439 Numbers that are not the sum of 2 distinct nonzero squares. 3
1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 14, 15, 16, 18, 19, 21, 22, 23, 24, 27, 28, 30, 31, 32, 33, 35, 36, 38, 39, 42, 43, 44, 46, 47, 48, 49, 51, 54, 55, 56, 57, 59, 60, 62, 63, 64, 66, 67, 69, 70, 71, 72, 75, 76, 77, 78, 79 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Charles R Greathouse IV, Table of n, a(n) for n = 1..10000

F. Smarandache, Definitions, Solved and Unsolved Problems, Conjectures, ... , edited by M. Perez, Xiquan Publishing House, 2000.

Index entries for sequences related to sums of squares

PROG

(PARI) is(n)=if(n<5, return(1)); my(f=factor(n)%4); if(vecmin(f[, 1])>1, return(1)); for(i=1, #f[, 1], if(f[i, 1]==3 && f[i, 2]%2, return(1))); 0 \\ Charles R Greathouse IV, Jun 18 2013

CROSSREFS

Complement of A004431.

Sequence in context: A173552 A188010 A008320 * A050126 A013939 A209921

Adjacent sequences:  A004436 A004437 A004438 * A004440 A004441 A004442

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified March 21 10:27 EDT 2019. Contains 321368 sequences. (Running on oeis4.)