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A144589 Prime(n-th "prime nonprime"). 1
2, 7, 19, 29, 53, 71, 97, 103, 137, 173, 193, 233, 263, 271, 311, 359, 409, 421, 463, 491, 503, 571, 607, 647, 701, 743, 757, 809, 821, 839, 971, 1009, 1049, 1061, 1151, 1181, 1231, 1283, 1303, 1367, 1429, 1451, 1543, 1553, 1579, 1601, 1699, 1831, 1873, 1879 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = prime(A144570(n)).
MAPLE
A141468 := proc(n) if n <=2 then n-1; else for a from procname(n-1)+1 do if not isprime(a) then return a; end if; end do: end if; end proc:
A144570 := proc(n) A141468(ithprime(n)) ; end proc:
A144589 := proc(n) ithprime(A144570(n)) ; end proc:
seq(A144589(n), n=1..120) ; # R. J. Mathar, May 01 2010
PROG
(PARI) c(n) = {for(k=0, primepi(n), isprime(n++)&&k--); n};
t(n) = if(n<3, n-1, c(n-2));
vector(100, n, prime(t(prime(n)))) \\ Altug Alkan, Oct 17 2015
CROSSREFS
Sequence in context: A259370 A103034 A038952 * A179002 A232667 A034794
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Jan 07 2009, corrected Jan 12 2009
EXTENSIONS
Extended by R. J. Mathar, May 01 2010
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)