

A085267


Numbers having at least two representations as sum of a squarefree number and a nonzero square.


2



6, 7, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78
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OFFSET

1,1


COMMENTS

Numbers n such that A085263(a(n)) > 1.
Conjecture: for n > 50, a(n) = n + 11.  Charles R Greathouse IV, Oct 26 2011


LINKS

Table of n, a(n) for n=1..67.
Eric Weisstein's World of Mathematics, Square Number
Eric Weisstein's World of Mathematics, Squarefree


PROG

(PARI) is(n)=my(t); forstep(k=sqrtint(n1), 1, 1, if(issquarefree(nk^2), if(t++>1, return(1)))); 0 \\ Charles R Greathouse IV, Mar 12 2012


CROSSREFS

Cf. A085265, A085266.
Sequence in context: A006364 A037301 A163247 * A118957 A037303 A135121
Adjacent sequences: A085264 A085265 A085266 * A085268 A085269 A085270


KEYWORD

nonn


AUTHOR

Reinhard Zumkeller, Jun 23 2003


STATUS

approved



