1,1

a(n) = 2*prime(n)-1 if n is in A137288. - Robert Israel, May 19 2020

Robert Israel, Table of n, a(n) for n = 1..10000

a(n) = A006530(A076274(n+1)). - Bernard Schott, May 20 2020

f:= n -> max(numtheory:-factorset(2*ithprime(n)-1)):

map(f, [$1..100]); # Robert Israel, May 19 2020

Cf. A006530, A076274, A137288.

Sequence in context: A023585 A089948 A336806 * A266603 A121278 A023587

Adjacent sequences: A023580 A023581 A023582 * A023584 A023585 A023586

nonn

Clark Kimberling

Name edited by Robert Israel, May 19 2020

approved