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approved
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Revision History for A130062
(Bold, blue-underlined text is an addition; faded, red-underlined text is aShowing entries 1-10 | older changes
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COMMENTS
The perfect squares in listed terms are a(1) = 1, a(3) = 49 = 7^2, a(13) = 32041 = 179^2 and a(29) = 383161 = 619^2. Note that primes {7,179,619} are the terms of A130060(n) = {2,3,7,179,619,17807,...} = Primes p such that p^2 divides 3^p - 2^p - 1; or primes in A127074(n).
Note that primes {7,179,619} are the terms of A130060 or primes in A127074.
CROSSREFS
Cf. A097934 = Primes p such that p divides 3^((p-1)/2) - 2^((p-1)/2). Cf. A038876(n) = Primes p such that 6 is a square mod p. Cf. A127071, A127072, A127073, A127074. Cf. A130058, A130059, A130061, A130063, A130060 = Primes p such that p^2 divides 3^p - 2^p - 1; or primes in A127074(n).
Cf. A097934 (primes p that divide 3^((p-1)/2) - 2^((p-1)/2).
Cf. A038876 (primes p such that 6 is a square mod p.
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proposed
editing
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NAME
Nonprime n numbers k such that n k divides 3^((nk+1)/2) - 2^((nk+1)/2) - 1.
LINKS
Amiram Eldar, <a href="/A130062/b130062.txt">Table of n, a(n) for n = 1..1000</a>
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approved
editing