A226100 - OEIS

%I #16 May 10 2014 09:52:08

%S 12,289,729,20151121,371293,2839760855281,24160660561265139,

%T 241100240228887100161,3421941488772218992567,

%U 845219547726738091164049,7506514445791062595879589895041,293936151563356954592299567713259041,6657844787831219696900816415217242830357

%N Main diagonal A(n,n) of matrix A(k,n) = n-th k-th power that becomes prime when its most significant (i.e., leftmost) decimal digit is removed.

%C Row 1 = A(1,n) = A226099. Row 2 = A(2,n) = A225873. Row 3 = A(3,n) = A226090. Row 4 = A(4,n) = A226092. Row 5 = A(5,n) = A226098.

%e a(1) = A(1,1) = 12 = first number whose first power (itself) becomes prime when its most significant (or leftmost) digit is removed.

%e a(2) = A(2,2) = 289 = second square which becomes prime when its most significant (or leftmost) digit is removed.

%e a(3) =

%Y Cf. A000040, A226099,  A225873, A226090, A226092, A226098.

%K nonn,base,easy

%O 1,1

%A _Jonathan Vos Post_, May 26 2013