cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A372419 Products of prime triples (p, p+4, p+6) where p = A022005(n).

Original entry on oeis.org

1001, 4199, 65231, 347261, 1009091, 1201289, 7566179, 11592209, 22027871, 29884301, 97543451, 234118799, 564234809, 627947039, 682238471, 1296207281, 2198678291, 2901757409, 3050714441, 3283574069, 4626836849, 4881262679, 5700149369, 6542683061, 6605851859, 7956061979
Offset: 1

Views

Author

Michael De Vlieger, Jun 29 2024

Keywords

Comments

Subsequence of A120944, subsequence of A007304.
Terms are congruent to 5 (mod 6), since A022005(n) is congruent to 1 mod 6, and 5+4 and 5+6 are congruent to 5 and 1 (mod 6), respectively. The product 1*5*1 is congruent to 5 (mod 6).

Examples

			a(1) = 1001 = 7 * 11 * 13.
a(2) = 4199 = 13 * 17 * 19.
a(3) = 65231 = 37 * 41 * 43, etc.
		

Crossrefs

Programs

  • Mathematica
    Map[Times @@ NextPrime[#, {0, 1, 2}] &, Select[Prime@ Range[320], AllTrue[{# + 4, # + 6}, PrimeQ] &]]