A082664 Numbers k such that A082647(k) = A000005(k) - 1.

2, 3, 5, 7, 9, 11, 13, 15, 17, 19, 23, 25, 29, 31, 35, 37, 41, 43, 47, 49, 53, 59, 61, 67, 71, 73, 77, 79, 83, 89, 91, 97, 101, 103, 107, 109, 113, 121, 127, 131, 137, 139, 143, 149, 151, 157, 163, 167, 169, 173, 179, 181, 187, 191, 193, 197, 199, 209, 211, 221, 223

Offset: 1

Author

Naohiro Nomoto, May 18 2003

Keywords

• easy
• nonn

Links

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

Crossrefs

Cf. A000005, A082647.

Programs

Mathematica

aQ[n_] := DivisorSum[n, 1 &, EvenQ[#] || # >= Sqrt[2n] &] == 1; Select[Range[250], aQ] (* Amiram Eldar, Jul 11 2019 *)