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A116301
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n times n+1 gives the concatenation of two numbers m and m+2.
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5
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768, 859, 911, 3286, 6714, 45453, 54547, 990101, 8181820, 70588234, 343130555, 362637364, 363636362, 420053632, 421052633, 497975710, 502024290, 578947367, 579946368, 636363638, 637362636, 656869445, 706766919
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listen;
history;
text;
internal format)
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OFFSET
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1,1
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LINKS
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Robert Israel, Table of n, a(n) for n = 1..9000
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MAPLE
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As:= {}:
for m from 2 to 20 do
acands:= map(t -> rhs(op(t)), [msolve(a*(a+1)=2, 10^m+1)]);
bcands:= map(t -> t*(t+1) mod 10^m, acands);
good:= select(t -> bcands[t]>=10^(m-1), [$1..nops(acands)]);
As:= As union convert(acands[good], set);
od:
sort(convert(As, list)); # Robert Israel, Aug 20 2019
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CROSSREFS
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Cf. A116170, A116294, A116302, A116307.
Sequence in context: A115934 A252072 A200856 * A219225 A045082 A257414
Adjacent sequences: A116298 A116299 A116300 * A116302 A116303 A116304
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KEYWORD
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nonn,base
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AUTHOR
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Giovanni Resta, Feb 06 2006
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STATUS
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approved
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