1,2

a(n) is the unique integer k such that A108951(k) = A019505(n).

Conjectured to be a subsequence of A329902.

Terms computed from b-file of A019505 provided by R. J. Mathar.

Table of n, a(n) for n=1..63.

a(n) = A329900(A019505(n)).

(PARI) A330745(n) = A329900(A019505(n));

Cf. A019505, A108951, A329900, A329902.

Cf. A330744 (conjectured subsequence).

Sequence in context: A101278 A329902 A091274 * A122525 A054589 A051851

Adjacent sequences: A330742 A330743 A330744 * A330746 A330747 A330748

nonn

Antti Karttunen, Jan 10 2020

approved