OFFSET
1,1
COMMENTS
These are the odd composites n (A071904) such that the digits of prime(n) are strictly increasing. The latter defines a subsequence of A028864, which lists primes with nondecreasing digits. - R. J. Mathar, Jan 30 2009
EXAMPLE
If odd number=n=9 and prime(9)=23, then 2<3 and 9=a(1). If odd number=n=15 and prime(15)=47, then 4<7 and 15=a(2). If odd number=n=33 and prime(33)=137, then 1<3<7 and 33=a(3), etc.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Juri-Stepan Gerasimov, Jan 27 2009
EXTENSIONS
Corrected and extended by R. J. Mathar, Jan 30 2009
Better definition from Omar E. Pol, Jan 31 2009
STATUS
approved