cp's OEIS Frontend

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.

A064077 Greater of odd twin prime powers (lesser = A064076).

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%I A064077 #12 Mar 19 2025 09:03:16
%S A064077 5,7,9,11,13,19,25,27,29,31,43,49,61,73,81,83,103,109,127,139,151,169,
%T A064077 181,193,199,229,241,243,271,283,313,349,361,421,433,463,523,571,601,
%U A064077 619,643,661,729,811,823,829,841,859,883,1021,1033,1051,1063,1093,1153
%N A064077 Greater of odd twin prime powers (lesser = A064076).
%C A064077 A006512 is a proper subsequence of this sequence (as A001359 is of A064076).
%H A064077 Amiram Eldar, <a href="/A064077/b064077.txt">Table of n, a(n) for n = 1..10000</a>
%F A064077 a(n) = A064076(n) + 2. - _Amiram Eldar_, Mar 19 2025
%e A064077 a(16) = 83^1 and 83 - 1 = 81 = 3^4 = A064076(16); a(20) = 139^1 and 139 - 2 = 137^1 = A064077(20).
%t A064077 Select[Partition[Select[Range[1, 1200, 2], PrimePowerQ], 2, 1], Differences[#] == {2} &][[;; , 2]] (* _Amiram Eldar_, Mar 19 2025 *)
%Y A064077 Cf. A064076, A000961, A006512, A061345.
%K A064077 nonn
%O A064077 1,1
%A A064077 _Reinhard Zumkeller_, Sep 01 2001