A064076 Lesser of odd twin prime powers (greater = A064077).

3, 5, 7, 9, 11, 17, 23, 25, 27, 29, 41, 47, 59, 71, 79, 81, 101, 107, 125, 137, 149, 167, 179, 191, 197, 227, 239, 241, 269, 281, 311, 347, 359, 419, 431, 461, 521, 569, 599, 617, 641, 659, 727, 809, 821, 827, 839, 857, 881, 1019, 1031, 1049, 1061, 1091, 1151

Offset: 1

Author

Reinhard Zumkeller, Sep 01 2001

Keywords

• nonn

Comments

A001359 is a proper subsequence of A064076 (as A006512 is of A064077).

Examples

			a(8) = 25 = 5^2 and 25+2 = 27 = 3^3 = A064077(8); a(10) = 29^1 and 29 + 2 = 31^1 = A064077(10).
		

Links

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

Crossrefs

Cf. A064077, A000961, A001359, A061345.

Programs

Mathematica

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

Formula

a(n) = A064077(n) - 2. - Amiram Eldar, Mar 19 2025