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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. 2
28, 819, 5397553488925, 155910789068784883, 468952332085139186546370744026318507437, 20936431529, 91765283361830966873857001143707378257, 17927087081, 1596235637603 (list; graph; refs; listen; history; text; internal format)
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

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Last modified September 28 13:24 EDT 2020. Contains 337393 sequences. (Running on oeis4.)