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A085703 a(1)=4, then least semiprime > a(n-1) such that when all in the sequence are concatenated together they form a prime. +0
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4, 21, 39, 49, 93, 161, 183, 201, 411, 543, 1003, 1043, 1387, 1389, 1527, 1589, 2509, 2519, 2559, 2881, 4143, 4613, 4821, 5251, 6821, 7123, 7671, 7679, 8373, 9993, 11463, 13201, 13349, 13647, 14349, 17617, 17753, 18931, 19253 (list; graph; listen)
OFFSET

1,1
EXAMPLE

a(3)=39 because it is a semiprime and 42139 is prime.

CROSSREFS

Sequence in context: A042429 A161444 A086474 this_sequence A063122 A110737 A042223

Adjacent sequences: A085700 A085701 A085702 this_sequence A085704 A085705 A085706

KEYWORD

nonn

AUTHOR

Jason Earls, Amarnath Murthy (zevi_35711(AT)yahoo.com), Jul 18 2003

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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