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A362966
Numbers k such that A007908(k) == 1 (mod k).
1
1, 121487, 293957, 13449179, 549999887
OFFSET
1,2
COMMENTS
a(6) > 10^11. - Jason Yuen, Oct 12 2024
PROG
(Python) # See A029455 for concat_mod
def isok(k): return concat_mod(10, k, k)==1%k # Jason Yuen, Oct 12 2024
CROSSREFS
KEYWORD
nonn,base,hard,more
AUTHOR
Max Alekseyev, Jun 06 2023
STATUS
approved