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 A120819 Indices of primes in A057137. 11

%I

%S 171,277,367,561,567,18881

%N Indices of primes in A057137.

%C Digits are in ascending order beginning with 1 and after 9 comes 0.

%C Indices of primes in A057137.

%D Clifford A. Pickover, A Passion for Mathematics, Wiley, 2005; see p. 61, 298.

%e a(1) = 12345678901234567890...01234567890...012345678901 = A057137(171) is the first prime term in A057137.

%t fQ[n_] := PrimeQ@ FromDigits@ Mod[Range@n, 10]; lst = {}; Do[ If[fQ@n, AppendTo[lst, n]; Print@n], {n, 10000}]; lst

%o (PARI) N=0;for(n=1,600,if(ispseudoprime(N=10*N+n%10),print1(n", "))) \\ _Charles R Greathouse IV_, May 10 2014

%Y Cf. A006055, A057137, A120828, A120820, A120821, A120822, A120823, A120824, A120825, A120826, A120827.

%K base,hard,nonn

%O 1,1

%A _Robert G. Wilson v_, Jul 05 2006

%E 18881 from Arjen K. Lenstra, Feb 20 2012

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Last modified February 19 10:34 EST 2019. Contains 320310 sequences. (Running on oeis4.)