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 A153801 #12 Oct 21 2024 04:36:12
%S A153801 0,0,0,0,2,4,2,12,38,60,76,90,480,564,1232,2150,2222,3156,4186,4352,
%T A153801 9616,9862,11130,19848,21604,23108,44394,86136,110394,131936,215964,
%U A153801 756708,859296,1257648,1398120,2976070,3021220,6972430,13466750,20995838,24036404,25964770
%N A153801 Index of Mersenne number A000225 that is also Mersenne prime A000668, minus n-th prime: a(n) = A000043(n) - A000040(n).
%H A153801 Amiram Eldar, <a href="/A153801/b153801.txt">Table of n, a(n) for n = 1..48</a>
%t A153801 With[{max = 48}, MersennePrimeExponent[Range[max]] - Prime[Range[max]]] (* _Amiram Eldar_, Oct 21 2024 *)
%Y A153801 Cf. A000040, A000043, A000668, A000225, A000396, A007691, A153800, A153802, A153803.
%K A153801 nonn
%O A153801 1,5
%A A153801 _Omar E. Pol_, Jan 13 2009
%E A153801 More terms from _R. J. Mathar_, Feb 19 2009
%E A153801 More terms from _Jinyuan Wang_, Mar 02 2020