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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
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
Sequence in context: A336503 A275717 A029449 * A014423 A101902 A236912
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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