%N Primes whose decimal expansion digits are grouped together.
%e E.g. 101 is not OK since the two digits 1 are separated by the 0. Prime 233 is OK since the digits 2 and 3 are grouped.
%Y Cf. A052086, A052081, A052082, A052083, A052084.
%A _Patrick De Geest_, Jan 15 2000.