A374476 Composite numbers k such that the least prime dividing the sum of divisors of k is equal to the least prime not dividing k.

8, 15, 21, 27, 32, 33, 35, 39, 45, 50, 51, 55, 57, 63, 65, 69, 75, 77, 85, 87, 91, 93, 95, 98, 99, 105, 111, 115, 117, 119, 123, 125, 128, 129, 133, 135, 141, 143, 145, 147, 153, 155, 159, 161, 165, 171, 175, 177, 183, 185, 187, 189, 195, 196, 200, 201, 203, 205, 207, 209, 213, 215, 217, 219, 221, 231, 235, 237

Offset: 1

Author

Antti Karttunen, Aug 06 2024

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..12000
• Index entries for sequences where odd perfect numbers must occur, if they exist at all

Crossrefs

Intersection of A002808 and A374475.

Cf. A000203, A020639, A053669, A374474.

Cf. A228058 (subsequence), and also A324534, A351458, A364286.

Programs

PARI

isA374476(n) = (!isprime(n) && A374474(n));