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A090924
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Least nonzero number having the same number of digits as n which when added to n yields a prime.
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0
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1, 1, 2, 1, 2, 1, 4, 3, 2, 13, 12, 11, 10, 15, 14, 13, 12, 11, 10, 11, 10, 15, 14, 13, 12, 11, 10, 13, 12, 11, 10, 11, 10, 13, 12, 11, 10, 15, 14, 13, 12, 11, 10, 15, 14, 13, 12, 11, 10, 11, 10, 15, 14, 13, 12, 11, 10, 13, 12, 11, 10, 11, 10, 15, 14, 13, 12, 11, 10, 13, 12, 11
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refs;
listen;
history;
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internal format)
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OFFSET
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1,3
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LINKS
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Table of n, a(n) for n=1..72.
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EXAMPLE
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a(29) = 12 and not 8 though 29+8 =37 is also a prime.
a(124) = 103 as 103 is the least three digit number such that 124 +103 = 227 is prime.
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MATHEMATICA
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lnzn[n_]:=Module[{k=10^(IntegerLength[n]-1)}, While[!PrimeQ[n+k], k++]; k]; Array[lnzn, 80] (* Harvey P. Dale, Jun 17 2012 *)
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CROSSREFS
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Sequence in context: A341827 A138567 A103530 * A247074 A160595 A105778
Adjacent sequences: A090921 A090922 A090923 * A090925 A090926 A090927
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KEYWORD
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base,easy,nonn
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AUTHOR
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Amarnath Murthy, Dec 21 2003
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EXTENSIONS
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More terms from David Wasserman, Feb 15 2006
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STATUS
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approved
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