OFFSET
0,1
COMMENTS
See A107648 = {1, 4, 6, 7, 384, 666, ...} for the indices of primes.
LINKS
Brady Haran and Simon Pampena, Glitch Primes and Cyclops Numbers, Numberphile video (2015).
Patrick De Geest, Palindromic Wing Primes: (1)8(1), updated: June 25, 2017.
Makoto Kamada, Factorization of 11...11811...11, updated Dec 11 2018.
Index entries for linear recurrences with constant coefficients, signature (111,-1110,1000).
FORMULA
MAPLE
A332118 := n -> (10^(2*n+1)-1)/9+7*10^n;
MATHEMATICA
Array[(10^(2 # + 1)-1)/9 + 7*10^# &, 15, 0]
PROG
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
M. F. Hasler, Feb 09 2020
STATUS
approved