

A129450


a(n) = smallest perfect power that begins and ends with digit n, 1 <= n <= 9; onedigit numbers are excluded.


1




OFFSET

1,1


LINKS



EXAMPLE

a(8) = 202^3 = 8242408; there is no smaller perfect power that begins and ends with digit 8.


PROG

(Magma) PP:=[1] cat [ n: n in [2..9000000]  IsPower(n) ]; firstlast:=function(x); for n:=1 to #PP do k:=Intseq(PP[n], 10); if #k gt 1 and k[1] eq x and k[ #k] eq x then return PP[n]; end if; end for; return 1; end function; [ firstlast(d): d in [1..9] ]; // Klaus Brockhaus, Apr 16 2007


CROSSREFS



KEYWORD

nonn,base,fini,full


AUTHOR



EXTENSIONS



STATUS

approved



