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A025010 a(1) = 5; a(n+1) = a(n)-th nonprime, where nonprimes begin at 4. 5
5, 10, 18, 28, 42, 60, 84, 115, 152, 198, 253, 320, 399, 494, 605, 736, 891, 1072, 1280, 1521, 1800, 2120, 2488, 2910, 3387, 3934, 4552, 5250, 6038, 6929, 7931, 9057, 10324, 11733, 13315, 15076, 17043, 19224, 21656, 24361, 27353, 30660, 34330, 38382, 42866 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Chai Wah Wu, Table of n, a(n) for n = 1..901

MATHEMATICA

g[ n_Integer ] := (k = n + PrimePi[ n ] + 1; While[ k - PrimePi[ k ] - 1, k++ ]; k); NestList[ g, 5, 45 ]

CROSSREFS

Cf. A006508, A022450, A022451, A025011.

Sequence in context: A035608 A091386 A164004 * A299144 A058555 A226445

Adjacent sequences:  A025007 A025008 A025009 * A025011 A025012 A025013

KEYWORD

nonn

AUTHOR

David W. Wilson

STATUS

approved

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Last modified December 6 06:57 EST 2019. Contains 329784 sequences. (Running on oeis4.)