A214133 Greater term of smallest primitive friendly pair such that both terms are divisible by the n-th prime p and coprime to the primes below p.

28, 819, 5397553488925, 155910789068784883, 468952332085139186546370744026318507437, 20936431529, 91765283361830966873857001143707378257, 17927087081, 1596235637603

Offset

1,1

Comments

By definition, GCD(a(n), A002110(n-1)) = 1. - Michel Marcus, Jan 19 2014

Links

Table of n, a(n) for n=1..9.

Example

For n=1, the perfect numbers 6=2*3 (A214132) and 28=2^2*7 are primitive friendly.
For n=2, 135=3^3*5 (A214132) and 819=3^2*7*13 are primitive friendly.

Crossrefs

Cf. A214132. Subset of sequence A096366.

Sequence in context: A041365 A042514 A158659 * A119055 A324450 A326279

Adjacent sequences: A214130 A214131 A214132 * A214134 A214135 A214136

Keyword

nonn

Author

Michel Marcus, Jul 05 2012

Extensions

a(7) corrected and a(8)-a(9) added by Michel Marcus, Jun 18 2016

Status

approved