%I A048899
%S A048899 0,3,18,68,443,1068,1068,32318,110443,1672943,3626068,23157318,
%T A048899 120813568,1097376068,1097376068,19407922943,49925501068,355101282318,
%U A048899 355101282318,15613890344818,15613890344818,110981321985443
%N A048899 Successive approximations up to 5^n for 5-adic integer sqrt(-1).
%C A048899 This is the root congruent to 3 mod 5.
%D A048899 K. Mahler, Introduction to p-Adic Numbers and Their Functions, Cambridge, 
               1973, p. 35.
%D A048899 J. H. Conway, The Sensual Quadratic Form, p. 118.
%o A048899 (PARI) a(n)=if(n<2,3,a(n-1)^5)%5^n
%Y A048899 A048899(n)=5^n-A034935(n).
%Y A048899 Sequence in context: A110689 A027333 A026576 this_sequence A107583 A157535 
               A098522
%Y A048899 Adjacent sequences: A048896 A048897 A048898 this_sequence A048900 A048901 
               A048902
%K A048899 nonn,easy
%O A048899 0,2
%A A048899 Michael Somos