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A155036
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Primes p = prime(c) with index c a composite such that the concatenation c//p is a prime.
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0
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7, 13, 37, 61, 103, 113, 149, 151, 181, 197, 199, 251, 263, 269, 271, 421, 439, 479, 487, 523, 631, 643, 653, 661, 677, 769, 811, 829, 853, 937, 947, 1019, 1039, 1049, 1051, 1277, 1319, 1399, 1427, 1489, 1543, 1663, 1753, 1759, 1831, 1867, 1901, 1933, 1949, 1999, 2039
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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EXAMPLE
| The composite c=4 of A002808 addresses prime(4) = 7 and the concatenation 47 is a prime, which adds 7 to the sequence.
The composite c=6 addresses prime(6)=13 and the concatenation 613 is prime which adds 13 to the sequence.
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CROSSREFS
| Cf. A000027, A000040, A002808.
Sequence in context: A117706 A066673 A173230 * A088985 A022005 A118819
Adjacent sequences: A155033 A155034 A155035 * A155037 A155038 A155039
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KEYWORD
| nonn,base,less
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)ranbler.ru), Jan 19 2009
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EXTENSIONS
| Edited and extended beyond 61 by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 05 2010
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