OFFSET
0,1
COMMENTS
There are no primes in this sequence because a(n) = round(n*2/3)*(5*10^n-1).
LINKS
Brady Haran and Simon Pampena, Glitch Primes and Cyclops Numbers, Numberphile video (2015).
Patrick De Geest, Palindromic Wing Primes: (3)4(3), updated: June 25, 2017.
Makoto Kamada, Factorization of 33...33433...33, updated Dec 11 2018.
Index entries for linear recurrences with constant coefficients, signature (111,-1110,1000).
FORMULA
MAPLE
A332134 := n -> (10^(2*n+1)-1)/3+10^n;
MATHEMATICA
Array[ (10^(2 # + 1)-1)/3 + 10^# &, 15, 0]
PROG
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
M. F. Hasler, Feb 09 2020
STATUS
approved