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

1,1

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

Prog

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

Crossrefs

Intersection of A002808 and A374475.

Cf. A000203, A020639, A053669, A374474.

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

Sequence in context: A355490 A082867 A075713 * A274290 A328410 A089025

Adjacent sequences: A374473 A374474 A374475 * A374477 A374478 A374479

Keyword

nonn

Author

Antti Karttunen, Aug 06 2024

Status

approved