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A204998
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a(n) = k^2 - j^2, where (k^2,j^2) is the least pair of distinct squares for which n divides their difference.
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4
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3, 8, 3, 8, 5, 12, 7, 8, 9, 20, 11, 12, 13, 28, 15, 16, 17, 72, 19, 20, 21, 44, 23, 24, 75, 52, 27, 28, 29, 60, 31, 32, 33, 68, 35, 72, 37, 76, 39, 40, 41, 84, 43, 44, 45, 92, 47, 48, 147, 200, 51, 52, 53, 108, 55, 56, 57, 116, 59, 60, 61, 124, 63, 64, 65, 132, 67, 68, 69, 140, 71, 72, 73, 148, 75, 76, 77, 156, 79, 80, 81, 164
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OFFSET
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1,1
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COMMENTS
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For a guide to related sequences, see A204892.
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(PARI) A204998(n) = { my(d); for(k=sqrtint(1+n), oo, for(j=1, k-1, if(!((d=(k^2)-(j^2))%n), return(d), if(d<n, break)))); }; \\ Antti Karttunen, Sep 28 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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