| 2, 2, 5, 5, 3, 2, 2, 5, 5, 3, 2, 2, 3, 5, 4, 6, 5, 5, 5, 7, 5, 3, 4, 7, 3, 2, 8, 2, 5, 3, 5, 4, 3, 3, 3, 6, 6, 5, 4, 3, 3, 6, 7, 4, 3, 4, 4, 4, 4, 3, 2, 3, 7, 5, 3, 2, 3, 5, 5, 3, 2, 3, 5, 2, 2, 3, 2, 3, 4, 5, 5, 3, 3, 3, 2, 3, 2, 5, 5, 5, 5 (list; graph; refs; listen; history; edit; text; internal format) |
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| OFFSET | 0,1 | | LINKS | | | FORMULA | | | EXAMPLE | For n=12, a(12)=3 because 12^3=1728 contains all decimal digits of n. Compare to A253600(12)=2 because 12^2=144 contains any digit of n. | | MATHEMATICA | seq={}; Do[k=1; Until[ContainsAll[IntegerDigits[n^k], IntegerDigits[n] ], k++]; AppendTo[seq, k] , {n, 0, 80}]; seq | | PROG | (Python) from itertools import count def a(n): s = set(str(n)) return next(k for k in count(2) if s <= set(str(n**k))) | | CROSSREFS | | | KEYWORD | nonn,base,new | | AUTHOR | | | STATUS | approved |
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