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

5, 7, 9, 11, 13, 19, 25, 27, 29, 31, 43, 49, 61, 73, 81, 83, 103, 109, 127, 139, 151, 169, 181, 193, 199, 229, 241, 243, 271, 283, 313, 349, 361, 421, 433, 463, 523, 571, 601, 619, 643, 661, 729, 811, 823, 829, 841, 859, 883, 1021, 1033, 1051, 1063, 1093, 1153

Offset: 1

Author

Reinhard Zumkeller, Sep 01 2001

Keywords

• nonn

Comments

A006512 is a proper subsequence of this sequence (as A001359 is of A064076).

Examples

			a(16) = 83^1 and 83 - 1 = 81 = 3^4 = A064076(16); a(20) = 139^1 and 139 - 2 = 137^1 = A064077(20).
		

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A064076, A000961, A006512, A061345.

Programs

Mathematica

Select[Partition[Select[Range[1, 1200, 2], PrimePowerQ], 2, 1], Differences[#] == {2} &][[;; , 2]] (* Amiram Eldar, Mar 19 2025 *)

Formula

a(n) = A064076(n) + 2. - Amiram Eldar, Mar 19 2025