

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
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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



