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A055003
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ithprime(ithprime(n)-1).
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7
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2, 3, 7, 13, 29, 37, 53, 61, 79, 107, 113, 151, 173, 181, 199, 239, 271, 281, 317, 349, 359, 397, 421, 457, 503, 541, 557, 577, 593, 613, 701, 733, 769, 787, 857, 863, 911, 953, 983, 1021, 1061, 1069, 1151, 1163, 1193, 1213, 1291, 1399, 1429
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Noncomposites (A008578) with prime (A000040) subscripts. a(n) = noncomposite(prime(n)) = A008578(A000040(n)). Subsequence of A175248 (noncomposites (A008578) with noncomposite (A008578) subscripts), a(n) = A175248(n+1). a(n) U A175249(n) = A008578(n). [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Mar 13 2010]
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EXAMPLE
| a(5) = 29 because a(5) = q(p(5)) = q(11) = 29, p = prime, q = noncomposite. [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Mar 13 2010]
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MAPLE
| with(numtheory): [seq(ithprime(ithprime(i)-1), i=1..70)];
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CROSSREFS
| Sequence in context: A048573 A006946 A074129 * A175248 A099361 A113823
Adjacent sequences: A055000 A055001 A055002 * A055004 A055005 A055006
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Jun 10 2000
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