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.

A373533 Least starting prime of exactly n consecutive primes p_i (i = 1..n) such that omega(p_i + 1) = 1 + i.

Original entry on oeis.org

5, 23, 499, 13093, 501343, 162598021, 25296334003
Offset: 1

Views

Author

Jean-Marc Rebert, Jun 08 2024

Keywords

Examples

			a(1) = 5, because omega(5+1) = 2, and no lesser number has this property.
For n=3, the primes starting at a(3) = 499 are as follows and are a run of exactly 3 omega = i+1,
  i          =  1    2    3
  p          = 499, 503, 509, 521
  omega(p+1) =  2,   3,   4,   3
               \-----------/
		

Crossrefs

Programs

  • Mathematica
    a[n_]:=Module[{k=1},While[Product[Boole[PrimeNu[Prime[k+i-1]+1]==1+i],{i,n}]==0, k++]; Prime[k]]; Array[a,5] (* Stefano Spezia, Jun 10 2024 *)