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 A028815 a(n) = n-th prime + 1 (starting with 1). 13
 2, 3, 4, 6, 8, 12, 14, 18, 20, 24, 30, 32, 38, 42, 44, 48, 54, 60, 62, 68, 72, 74, 80, 84, 90, 98, 102, 104, 108, 110, 114, 128, 132, 138, 140, 150, 152, 158, 164, 168, 174, 180, 182, 192, 194, 198, 200, 212, 224, 228, 230, 234, 240, 242, 252, 258, 264, 270, 272, 278, 282, 284 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS n-th noncomposite (unit or prime) positive integer + 1. The "0th prime" is defined to be 1 (a unit, formerly considered to be prime). LINKS Table of n, a(n) for n=0..61. FORMULA a(n) = prime(n) + 1 = A000040(n) + 1 = A008864(n) for n >= 1. a(n) = A008578(n+1) + 1, n >= 0. MATHEMATICA Join[{2}, Prime[Range[70]]+1] (* Harvey P. Dale, Oct 14 2019 *) PROG (PARI) a(n) = if(n==0, 2, prime(n) + 1); \\ Altug Alkan, Mar 14 2018 CROSSREFS Cf. A008864, A006093, A008578, A000040. Sequence in context: A336503 A275717 A029449 * A014423 A101902 A236912 Adjacent sequences: A028812 A028813 A028814 * A028816 A028817 A028818 KEYWORD nonn,easy AUTHOR N. J. A. Sloane STATUS approved

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Last modified February 22 08:11 EST 2024. Contains 370240 sequences. (Running on oeis4.)