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Diffstat (limited to '34.patch')
| -rw-r--r-- | 34.patch | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/34.patch b/34.patch new file mode 100644 index 000000000000..55c971971976 --- /dev/null +++ b/34.patch @@ -0,0 +1,24 @@ +From e6258748e92f8244a144c21a67af7e3713beaac8 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Daniel=20=C8=98uteu?= <trizen@protonmail.com> +Date: Tue, 5 Nov 2019 16:47:38 +0200 +Subject: [PATCH] Handle 2^n in is_totient() + +Fixes https://github.com/danaj/Math-Prime-Util/issues/33. + +See also: [A058213](https://oeis.org/A058213), [A058215](https://oeis.org/A058215). +--- + util.c | 1 + + 1 file changed, 1 insertion(+) + +diff --git a/util.c b/util.c +index e03ac43..4199254 100644 +--- a/util.c ++++ b/util.c +@@ -1059,6 +1059,7 @@ static int _totpred(UV n, UV maxd) { + int res; + + if (n & 1) return 0; ++ if ((n & (n-1)) == 0) return 1; + n >>= 1; + if (n == 1) return 1; + if (n < maxd && is_prime(2*n+1)) return 1; |