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A173575
5-Factorions: equal to the sum of the quintuple factorials of their digits in base 10.
2
1, 2, 3, 4, 5, 6, 39
OFFSET
1,2
EXAMPLE
39 -> 3!!!!! + 9!!!!! = 3 + 9*4 = 3 + 36 = 39.
MAPLE
P:=proc(n, m) local a, b, i, j, k, x, w; for i from 1 by 1 to n do a:=0; b:=0; w:=0; k:=i; while k>0 do w:=k-(trunc(k/10)*10); j:=w; x:=w-m; if w=0 then b:=1; else while x>0 do j:=j*x; x:=x-m; od; b:=j; fi; a:=a+b; k:=trunc(k/10); od; if a=i then lprint(i, a); fi; od; end: P(1000, 5);
KEYWORD
easy,fini,nonn,base
AUTHOR
STATUS
approved