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A195327 Number of bases to which terms of A194946 are pseudoprime. 3

%I #15 May 09 2021 02:17:35

%S 2,4,8,16,36,40,48,100,144,324,484,900,1296,1764,2116,2704,3600,6084,

%T 9216,13728,19044,24336,30000,39204,39360,44100,51984,63888,72900,

%U 81648,93636,108900,112896,133956,142884,191844,229376,248004,269568,298116

%N Number of bases to which terms of A194946 are pseudoprime.

%H Charles R Greathouse IV, <a href="/A195327/b195327.txt">Table of n, a(n) for n = 1..659</a>

%H <a href="/index/Ps#pseudoprimes">Index entries for sequences related to pseudoprimes</a>

%o (PARI) bases(n)=my(f=factor(n)[, 1]); n--; prod(i=1, #f, gcd(f[i]-1, n)) \\ Given a value of A194946, this function transforms it to a term of this sequence.

%Y Cf. A194946, A195328.

%K nonn

%O 1,1

%A _Charles R Greathouse IV_, Sep 15 2011

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Last modified April 14 18:28 EDT 2024. Contains 371667 sequences. (Running on oeis4.)