A387523 Primes in the order in which they first divide a term of A386482.

2, 3, 5, 7, 13, 11, 17, 19, 23, 29, 31, 43, 41, 37, 47, 67, 61, 59, 53, 73, 71, 83, 79, 113, 109, 107, 103, 101, 97, 89, 127, 157, 151, 149, 139, 137, 131, 193, 191, 181, 179, 173, 167, 163, 199, 197, 211, 251, 241, 239, 233, 229, 227, 223, 313, 311, 307, 293, 283, 281, 277, 271, 269, 263, 257, 337, 331, 317, 467, 463, 461, 457

Offset

1,1

Comments

Conjecture: if c is the first term in A386482 that is divisible by a prime p > 2, then c = 2*p.

Links

Michael De Vlieger, Table of n, a(n) for n = 1..65536 (first 841 terms from N. J. A. Sloane.)

Example

11 first divides A386482(23), but 13 first divides A386482(21), so 13 precedes 11 in this sequence.

Mathematica

Block[{p, s}, p[_] := 0; s = Import["https://oeis.org/A386482/b386482.txt", "Data"][[All, -1]]; Rest@ Reap[Do[Map[If[p[#] == 0, Set[p[#], n]; Sow[#]] &, FactorInteger[s[[n]] ][[;; , 1]]], {n, Length[s]}] ][[-1, 1]] ] (* Michael De Vlieger, Sep 03 2025 *)

Crossrefs

Cf. A386482, A386483, A387072, A387076, A387077, A387522, A387524.

Sequence in context: A126056 A126055 A126054 * A067836 A332806 A108546

Adjacent sequences: A387520 A387521 A387522 * A387524 A387525 A387526

Keyword

nonn

Author

N. J. A. Sloane, Sep 03 2025

Status

approved