login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

Primes with prime "Look And Say" descriptions from left to right (irrespective of method A or method B).
3

%I #4 Mar 31 2012 10:26:06

%S 3,7,17,23,113,137,193,271,431,479,587,691,757,809,829,1009,1123,1181,

%T 1459,2089,2111,2131,2243,2273,2473,2617,2671,3067,3169,3607,3697,

%U 4567,4603,5059,5407,5749,6007,6037,6449,6607,6673,7207,7669,7927,8089,8849

%N Primes with prime "Look And Say" descriptions from left to right (irrespective of method A or method B).

%F Intersection of A056815 and A127175.

%e 137 and 1123, for instance, belong to the sequence because their respective descriptions 111317 (one 1, one 3, one 7) or 113171 (1 once, 3 once 7 once) and 211213 (two 1's, one 2, one 3) or 122131 (1 twice, 2 once, 3 once) are all primes.

%Y Cf. A056815, A127175.

%K base,nonn

%O 1,1

%A _Lekraj Beedassy_, Jan 07 2007

%E Corrected and extended by _Ray Chandler_, Jan 08 2007