This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A048848 #15 Feb 22 2024 20:21:42 %S A048848 2,2,3,3,7,3,13,7,13,7,29,7,37,13,19,19,53,13,61,19,37,29,79,19,71,37, %T A048848 61,37,107,19,113,53,71,53,89,37,151,61,89,53,173,37,181,71,89,79,199, %U A048848 53,181,71,131,89,239,61,173,89,151,107,271,53,281 %N A048848 a(n) = prime(phi(n)). %H A048848 Antti Karttunen, <a href="/A048848/b048848.txt">Table of n, a(n) for n = 1..10000</a> %F A048848 a(n) = A000040(A000010(n)). %p A048848 with(numtheory); [ seq(ithprime(phi(i)),i=1..80) ]; %t A048848 Prime[EulerPhi[Range[70]]] (* _Harvey P. Dale_, Nov 24 2022 *) %o A048848 (PARI) A048848(n) = prime(eulerphi(n)); \\ _Antti Karttunen_, Dec 05 2017 %o A048848 (Magma) [NthPrime(EulerPhi(n)): n in [1..100]]; // _G. C. Greubel_, Feb 22 2024 %o A048848 (SageMath) [nth_prime(euler_phi(n)) for n in range(1,101)] # _G. C. Greubel_, Feb 22 2024 %Y A048848 Cf. A000010, A000040, A048849. %K A048848 nonn %O A048848 1,1 %A A048848 _N. J. A. Sloane_ %E A048848 Offset corrected by _Antti Karttunen_, Dec 05 2017