OFFSET
1,1
COMMENTS
The corresponding values of k are 0, 1, 2, 3, 4, 5, 13, 15, 19, 22, 24, 48, 59, 187, 215, 232. - Bruno Berselli, Jan 29 2018
Further values of k (below 4000): 394, 441, 506, 541, 569, 1456, 2136, 3510. - Daniel Starodubtsev, Jan 05 2020
EXAMPLE
5039 is prime and 5039 = 121*42 - 43, hence it is in the sequence.
51239 is prime and 51239 = 1221*42 - 43, hence it is in the sequence.
513333239 = 12222221*42 - 43 = 61*1747*4817 is not prime, therefore it is not in the sequence.
MATHEMATICA
Select[42 NestList[10 # + 11 &, 11, 50] - 43, PrimeQ] (* Michael De Vlieger, Feb 01 2018, after Harvey P. Dale at A132583 *)
CROSSREFS
KEYWORD
nonn,base,less,more
AUTHOR
Paolo Galliani, Jan 27 2018
EXTENSIONS
a(8)-a(12) from Bruno Berselli, Jan 29 2018
STATUS
approved