OFFSET
1,1
COMMENTS
The semiprimes in A045533.
LINKS
EXAMPLE
35 is in the sequence because the concatenation of [3, 5] = 35 = 5 * 7, which is semiprime.
1923 is in the sequence because concatenation of [19, 23] = 1923 = 3 * 641, which is semiprime.
1113 is not in the sequence because, though 1113 is concatenation of two consecutive primes [11, 13], 1113 = 3 * 7 * 53, which is not semiprime.
MAPLE
MATHEMATICA
CROSSREFS
KEYWORD
nonn,base
AUTHOR
K. D. Bajpai, Jun 18 2014
STATUS
approved