0,3

Rémy Sigrist, Table of n, a(n) for n = 0..7528

Rémy Sigrist, PARI program for A330340

a(n) + A030101(a(n)) = A092213(n).

a(n) <= A331585(n).

For n = 3:

- A092213(3) = 5,

- 4 is the least k such that k + reverse(k) = 5,

- so a(3) = 4.

(PARI) See Links section.

Cf. A030101, A055944, A092213, A331585.

Sequence in context: A255552 A255551 A332072 * A328696 A053629 A227370

Adjacent sequences: A330337 A330338 A330339 * A330341 A330342 A330343

nonn,base

Rémy Sigrist, Jan 21 2020

approved