OFFSET
1,1
EXAMPLE
41, 337, 809, 1123, for instance, are in the sequence because their respective descriptions 4111 (4 once, 1 once), 3271 (3 twice, 7 once), 810191 (8 once, 0 once, 9 once), 122131 (1 twice, 2 once, 3 once) are also primes.
MATHEMATICA
LookAndSayB[ n_] := FromDigits@Flatten@((Through[ {First, Length}[ # ] ] &) /@ Split@IntegerDigits@n); Select[Prime@Range[215], PrimeQ@LookAndSayB@# &] (* Ray Chandler, Jan 08 2007 *)
CROSSREFS
KEYWORD
base,nonn
AUTHOR
Lekraj Beedassy, Jan 07 2007
EXTENSIONS
Corrected by Ray Chandler, Jan 08 2007
STATUS
approved