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A159477
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a(n) = smallest primes >= n, if 1 is counted as a prime.
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2
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1, 2, 3, 5, 5, 7, 7, 11, 11, 11, 11, 13, 13, 17, 17, 17, 17, 19, 19, 23, 23, 23, 23, 29, 29, 29, 29, 29, 29, 31, 31, 37, 37, 37, 37, 37, 37, 41, 41, 41, 41, 43, 43, 47, 47, 47, 47, 53, 53, 53, 53, 53, 53, 59, 59, 59, 59
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 1..1000
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FORMULA
| For n >= 2, a(n) = A007918(n). a(p) = p, a(c) = a(c+1), for p = primes (A000040), c = composite numbers (A002808).
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MATHEMATICA
| Join[{1}, NextPrime[Range[60]]] (* From Harvey P. Dale, Jan 04 2012 *)
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PROG
| (Haskell)
a159477 n = a159477_list !! (n-1)
a159477_list = 1 : concat
(zipWith (\p q -> replicate (fromInteger $ (q - p)) q)
a008578_list $ tail a008578_list)
-- Reinhard Zumkeller, Nov 09 2011
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CROSSREFS
| Cf.: A007918, A000040, A002808.
Cf. A008578.
Sequence in context: A126762 A082048 A113459 * A123318 A186698 A111060
Adjacent sequences: A159474 A159475 A159476 * A159478 A159479 A159480
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KEYWORD
| nonn
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AUTHOR
| Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Apr 13 2009
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