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 A051701 Closest prime to n-th prime p that is different from p (break ties by taking the smaller prime). 5
 3, 2, 3, 5, 13, 11, 19, 17, 19, 31, 29, 41, 43, 41, 43, 47, 61, 59, 71, 73, 71, 83, 79, 83, 101, 103, 101, 109, 107, 109, 131, 127, 139, 137, 151, 149, 151, 167, 163, 167, 181, 179, 193, 191, 199, 197, 199, 227, 229, 227, 229, 241, 239, 257, 251, 257, 271, 269 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A227878 gives the terms occurring twice. - Reinhard Zumkeller, Oct 25 2013 LINKS T. D. Noe, Table of n, a(n) for n = 1..1000 EXAMPLE Closest primes to 2,3,5,7,11 are 3,2,3,5,13. MATHEMATICA a[n_] := (p = Prime[n]; np = NextPrime[p]; pp = NextPrime[p, -1]; If[np-p < p-pp, np, pp]); Table[a[n], {n, 1, 58}] (* Jean-François Alcover, Oct 20 2011 *) cp[{a_, b_, c_}]:=If[c-b

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Last modified October 15 01:40 EDT 2019. Contains 328025 sequences. (Running on oeis4.)