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A346992 Numbers occurring as divisors of 3^k + 5^k. 1
1, 2, 4, 8, 13, 17, 19, 23, 26, 29, 31, 34, 37, 38, 41, 46, 47, 53, 58, 62, 73, 74, 76, 79, 82, 83, 89, 92, 94, 97, 101, 106, 107, 113, 124, 137, 139, 146, 149, 151, 152, 157, 158, 166, 167, 169, 178, 184, 188, 193, 194, 199, 202, 211, 212, 214, 221, 226, 227 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
If n is a term, then so are all divisors of n. - Robert Israel, Dec 08 2022
LINKS
MAPLE
filter:= proc(n) local v;
if igcd(n, 15) <> 1 then return false fi;
q:= 5/3 mod n;
traperror(NumberTheory:-ModularLog(-1, q, n)) <> lasterror
end proc:
filter(1):= true:
select(filter, [$1..300]); # Robert Israel, Dec 08 2022
CROSSREFS
Sequence in context: A292430 A018335 A030058 * A058329 A037380 A328005
KEYWORD
nonn
AUTHOR
Hugo Pfoertner, Aug 11 2021
STATUS
approved

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Last modified March 1 08:00 EST 2024. Contains 370430 sequences. (Running on oeis4.)