A155036 Primes p = prime(c) with index c a composite such that the concatenation c//p is a prime.

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

Offset

1,1

Links

Table of n, a(n) for n=1..51.

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.

Crossrefs

Cf. A000027, A000040, A002808.

Sequence in context: A267985 A173230 A361483 * A088985 A022005 A281317

Adjacent sequences: A155033 A155034 A155035 * A155037 A155038 A155039

Keyword

nonn,base,less

Author

Juri-Stepan Gerasimov, Jan 19 2009

Extensions

Edited and extended beyond 61 by R. J. Mathar, May 05 2010

Status

approved