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 A076669 Primes of the form n^2*totient(n)+1 (or A053191(n) + 1). 0

%I

%S 2,5,19,101,73,257,487,401,577,2029,1801,23549,29401,25601,21169,

%T 77659,83233,52489,121001,57601,115321,87121,197137,564899,462401,

%U 697049,649801,403369,588061,1020101,887113,893041,922561,696961,1910413,837937,940801,1411481

%N Primes of the form n^2*totient(n)+1 (or A053191(n) + 1).

%C These primes are neither sorted nor unique. They are listed in the order they are found. - _Michel Marcus_, Jul 23 2015

%o (PARI) lista(nn) = for (n=1, nn, if (isprime(p=n^2*eulerphi(n)+1), print1(p, ", "))); \\ _Michel Marcus_, Jul 23 2015

%Y Cf. A053191.

%K easy,nonn

%O 1,1

%A _Enoch Haga_, Jan 16 2004

%E Name corrected by _Michel Marcus_, Jul 23 2015

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Last modified December 5 04:09 EST 2020. Contains 338943 sequences. (Running on oeis4.)