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A028815
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a(n) = prime(n) + 1 (starting with 1).
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14
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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)
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OFFSET
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0,1
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COMMENTS
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n-th noncomposite (unit or prime) positive integer + 1.
The "0th prime" is defined to be 1 (a unit, formerly considered to be prime).
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LINKS
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FORMULA
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MATHEMATICA
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PROG
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(PARI) a(n) = if(n==0, 2, prime(n) + 1); \\ Altug Alkan, Mar 14 2018
(Magma)
A028815:= func< n | n eq 0 select 2 else 1 + NthPrime(n) >;
(SageMath)
def A028815(n): return 2 if n==0 else 1+nth_prime(n)
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CROSSREFS
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KEYWORD
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nonn,easy,changed
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AUTHOR
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STATUS
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approved
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