A043292 - OEIS

A043292

Numbers that divide 10^k + 1 for some k.

1, 2, 7, 11, 13, 17, 19, 23, 29, 47, 49, 59, 61, 73, 77, 89, 91, 97, 101, 103, 109, 113, 121, 127, 131, 133, 137, 139, 143, 149, 157, 161, 167, 169, 179, 181, 193, 197, 209, 211, 223, 229, 233, 241, 247, 251, 253, 257, 263, 269, 281, 289, 293, 299, 313, 329

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OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

filter:= n -> traperror(NumberTheory:-ModularLog(-1, 10, n)) <> "no solutions exist":

filter(2):= true:

select(filter, [$1..500]); # Robert Israel, Feb 11 2023

CROSSREFS

Cf. A014657, A069531.

Odd primes in this sequence are A028416.