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A116339
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k times k+6 gives the concatenation of two numbers m and m+7.
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6
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378, 617, 708, 903, 8761, 45456, 54539, 693063, 8181812, 88235288, 327935224, 330669332, 363636365, 418318517, 428571430, 461538455, 538461540, 571428565, 581681478, 636363630, 669330663, 672064771, 691571588
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OFFSET
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1,1
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LINKS
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MAPLE
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f:= proc(d) local S, x;
S:= map(rhs@op, [msolve((x+3)^2 = 16, 10^d+1)]);
end proc:
g:= proc(n, d) local m; m:= ((n+3)^2-16)/(10^d+1)+7; m >= 10^(d-1) and m < 10^d end proc:
sort([seq](op(select(g, f(i), i)), i=2..13)); # Robert Israel, Jan 27 2024
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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