A195759 Greater prime factor of n-th Blum number.

7, 11, 19, 23, 11, 31, 43, 19, 47, 23, 59, 67, 19, 71, 31, 79, 83, 23, 43, 103, 107, 47, 31, 127, 131, 59, 139, 23, 151, 67, 43, 163, 71, 167, 47, 179, 79, 191, 83, 31, 199, 211, 59, 223, 227, 31, 239, 103, 67, 107, 251, 71, 263, 271, 43, 283, 79, 127, 47

Offset

1,1

Comments

A195758(n) * a(n) = A016105(n); a(n) > A195758(n);

a(n) = A006530(A016105(n)).

Links

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

Wikipedia, Blum integer

Prog

(Haskell)
a195759 = a006530 . a016105

Crossrefs

Cf. A070647.

Sequence in context: A190689 A048215 A131192 * A130570 A106081 A329857

Adjacent sequences: A195756 A195757 A195758 * A195760 A195761 A195762

Keyword

nonn

Author

Reinhard Zumkeller, Sep 23 2011

Status

approved