OFFSET
1,1
COMMENTS
There are 18 such integers:
1147=31*37,1159=19*61,1189=29*41,1343=17*79,1711=29*59,1943=29*67,
1961=37*53,2911=41*71,2923=37*79,3713=47*79,4171=43*97,4183=47*89,
4189=59*71,4307=59*73,4331=61*71,4717=53*89,5329=73*73,5917=61*97.
Two particularly interesting cases:
1159=19*61=> 1961=37*53, 2911=41*71 =>4171=43*97.
EXAMPLE
1147 = concatenation of primes 11 and 47 and product of primes 31 and 37.
CROSSREFS
KEYWORD
base,fini,full,nonn
AUTHOR
Zak Seidov, Jan 18 2011
STATUS
approved