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A131604
Primes of the form r(r(r(r(r(r(r(k)+1)+1)+1)+1)+1)+1)+1, where r(k) = A141468(k) = k-th nonprime.
0
2, 67, 71, 151, 157, 199, 257, 263, 277, 281, 311, 359, 373, 401, 461, 467, 499, 503, 521, 523, 541, 563, 571, 577, 613, 641, 661, 673, 677, 733, 739, 743, 761, 809, 829, 859, 863, 911, 929, 941, 967, 983, 991, 1019, 1031, 1051, 1063, 1093, 1103, 1123
OFFSET
1,1
EXAMPLE
At k=3, we have
r(r(r(r(r(r(r(3)+1)+1)+1)+1)+1)+1)+1
= r(r(r(r(r(r(4+1)+1)+1)+1)+1)+1)+1
= r(r(r(r(r(r(5)+1)+1)+1)+1)+1)+1
= r(r(r(r(r(8+1)+1)+1)+1)+1)+1
= r(r(r(r(r(9)+1)+1)+1)+1)+1
= r(r(r(r(14+1)+1)+1)+1)+1
= r(r(r(r(15)+1)+1)+1)+1
= r(r(r(22+1)+1)+1)+1
= r(r(r(23)+1)+1)+1
= r(r(33+1)+1)+1
= r(r(34)+1)+1
= r(48+1)+1
= r(49)+1
= 66+1
= 67.
CROSSREFS
Sequence in context: A245097 A139864 A107993 * A139861 A065721 A030472
KEYWORD
nonn,less
AUTHOR
EXTENSIONS
211 removed, 355 replaced by 359 and extended by R. J. Mathar, Sep 05 2008
STATUS
approved