A376488 a(n) is the least k such that A375422(k) = n.

1, 2, 4, 9, 13, 16, 18, 21, 71, 72, 75, 77, 79, 82, 84, 85, 88, 93, 95, 97, 470, 472, 475, 497, 500, 511, 515, 526, 529, 544, 557, 2618, 2738, 2743, 2744, 2749, 2761, 2762, 2827, 2832, 2835, 2862, 2890, 2892, 2895, 2896, 2901, 2902, 2910, 2932, 2938, 2955

Offset: 1

Author

Rémy Sigrist, Sep 25 2024

Keywords

• nonn

Comments

In other words, a(n) is the least k such that the set {(1, prime(1)), (2, prime(2)), ..., (k, prime(k))} contains n aligned points (where prime(k) denotes the k-th prime number).

Is this sequence infinite?

Links

• Rémy Sigrist, Table of n, a(n) for n = 1..102
• Rémy Sigrist, PARI program

Crossrefs

Cf. A375422, A376187, A376188.

Programs

PARI

\\ See Links section.