[seqfan] Smallest emirp with emirp number of digits and emirp digital sum
jvospost3 at gmail.com
Thu Nov 19 04:19:48 CET 2009
Is 1000000004161 the smallest emirp (A006567) with emirp number of
digits and emirp digital sum?
It is prime, its reversal 1614000000001 is prime, it has a prime 13
digits, R(13) = 31 is prime, and the
sum of digits 1+6+1+4+0+0+0+0+0+0+0+0+1 = 13 is prime (and reversed is
again the prime 31).
Or did I miss a smaller example in my sloppy by-hand search?
For people who hate the word "emirp" this may be the worst seq yet
encountered .. this an the 2nd smallest, 3rd smallest, etc.
More information about the SeqFan