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 A051698 Closest prime to n that is different from n (break ties by taking the smaller prime). 1
 2, 2, 3, 2, 3, 3, 5, 5, 7, 7, 11, 13, 11, 11, 13, 13, 17, 19, 17, 17, 19, 19, 23, 19, 23, 23, 23, 29, 29, 31, 29, 29, 31, 31, 31, 37, 37, 41, 37, 37, 41, 43, 41, 41, 43, 43, 47, 43, 47, 47, 47, 53, 53, 47, 53, 53, 53, 59, 59, 61, 59, 59, 61, 61, 61, 67, 67, 71, 67, 67, 71, 73 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS Harvey P. Dale, Table of n, a(n) for n = 0..1000 EXAMPLE Closest primes to 0,1,2,3,4 are 2,2,3,2,3. MATHEMATICA cp[n_]:=Module[{p1=NextPrime[n, -1], p2=NextPrime[n]}, If[p2-n

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Last modified August 25 09:40 EDT 2019. Contains 326323 sequences. (Running on oeis4.)