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A243534
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Numbers n such that the list of all divisors of n contains only 1 distinct digit (in base 10).
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15
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OFFSET
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1,2
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COMMENTS
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Union of 1 and A004022 (prime repunits).
The next term has 317 digits.
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LINKS
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FORMULA
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a(1) = 1; for n >= 2, a(n+1) = A004022 (prime repunits).
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EXAMPLE
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11 is in sequence because the list of the divisors of 11: (1, 11) contains only 1 distinct digit.
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PROG
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(Excel) [Row n = 1 …10000; Column A: A(n) = A095048(n); Column B: B(n) = IF(A(n)=1; A(n)); Arrangement of column B]
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CROSSREFS
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KEYWORD
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nonn,base
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AUTHOR
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STATUS
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approved
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