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A066618
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Both n and its reverse are one more than a square and n does not end in 0.
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2
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1, 2, 5, 101, 626, 5477, 7745, 10001, 1000001, 1010026, 1040401, 2217122, 2676497, 5053505, 6200101, 7946762, 100000001, 101808101, 10000000001, 10180608202, 10182828101, 10408080401, 20280608101, 26573890226, 26995147205
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Harry J. Smith, Table of n, a(n) for n=1,...,53
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EXAMPLE
| 7745 = 88^2 + 1 and 5477 = 74^2 + 1
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MATHEMATICA
| dtn[L_] := Fold[10#1+#2&, 0, L] A={}; For[i=1, i>0, i++, t=dtn[Reverse[IntegerDigits[i^2+1]]]; If[IntegerQ[(t-1)^(1/2)]&&Mod[i^2, 10]=!=9, AppendTo[A, i^2+1]; Print[A]]]
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PROG
| (PARI) Rev(x)= { local(d, r=0); while (x>0, d=x%10; x\=10; r=r*10 + d); return(r) } { n=0; for (m=0, 10^10, k=m^2 + 1; if (k%10 && issquare(Rev(k) - 1), write("b066618.txt", n++, " ", k); if (n==100, return)) ) } [From Harry J. Smith (hjsmithh(AT)sbcglobal.net), Mar 13 2010]
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CROSSREFS
| Sequence in context: A093308 A162569 A120800 * A027720 A132482 A136106
Adjacent sequences: A066615 A066616 A066617 * A066619 A066620 A066621
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KEYWORD
| base,nonn
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AUTHOR
| Erich Friedman (efriedma(AT)stetson.edu), Jan 08 2002
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