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 A246557 Numbers n with an even number of digits such that the product of the numbers formed by successively deleting pairs of digits from the ends of n is equal to n. 0
 116955, 125000, 228177, 375000, 495248 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The sequence is finite. If the number of digits of n is odd then the analogous product can never equal n. LINKS EXAMPLE 116955 is in the sequence because we get 1695 and then 69, whose product is 116955. MAPLE lst:={}: for a from 1 to 99 do:   for b from 1 to 9 do:    for c from 0 to 9 do:       x1:=a*10+c:x:=b*10^length(x1)+x1: z:=a*x:l:=length(z) : u:=(z-irem(z, 10))/10: v0:=irem(u, 10^(l-2)):        if v0 = x then lst:=lst union {z}: else fi:    od:   od: od: print(lst): CROSSREFS Sequence in context: A156417 A156865 A233681 * A289911 A206204 A251953 Adjacent sequences:  A246554 A246555 A246556 * A246558 A246559 A246560 KEYWORD nonn,fini,full,base AUTHOR Michel Lagneau, Nov 15 2014 STATUS approved

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Last modified January 21 07:12 EST 2022. Contains 350473 sequences. (Running on oeis4.)