OFFSET
1,1
EXAMPLE
71 and 311, for instance, belongs to the sequence because their respective descriptions 1117 (one 1, one 7) or 1171 (1 once, 7 once) and 2113 (two 1's, one 3) or 1231 (1 twice, 3 once) are all primes.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Lekraj Beedassy, Jan 07 2007
EXTENSIONS
Extended by Ray Chandler, Jan 16 2007
STATUS
approved