A318826 a(n) is the first prime p that starts a run of length n of multiples of itself in alternate terms of A254077.

5, 17, 41, 2137, 11455307, 1178314103

Offset: 1

Author

John Mason, Sep 05 2018

Keywords

• nonn
• more

Comments

a(n) is the first prime p occurring at position m in A254077, satisfying the condition that A254077(m + 2i) = p*(i+2) for all i from 1 through n. Also, A254077(m-2) = p*2.

John P. Linderman calculated and confirmed a(6).

Examples

			a(1)=5 because A254077(10)=5 and A254077(12)=15;
a(2)=17 because A254077(33)=17 and A254077(35)=51 and A254077(37)=68.
		

Links

• John P. Linderman, Notes on computation of first 5 billion terms
• John Mason, Some observations related to A254077

Crossrefs

Cf. A254077.