OFFSET
1,2
LINKS
Harry J. Smith, Table of n, a(n) for n = 1..53
EXAMPLE
7745 = 88^2 + 1 and 5477 = 74^2 + 1.
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]]]
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)) ) } \\ Harry J. Smith, Mar 13 2010
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Erich Friedman, Jan 08 2002
STATUS
approved