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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

User: Harsh Aggarwal

Harsh Aggarwal's wiki page.

Harsh Aggarwal has authored 2 sequences.

A377184 Numbers k such that L(k)+1 is prime, where L(k) is the k-th Lucas number.

Original entry on oeis.org

0, 1, 3, 6, 18
Offset: 1

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Author

Harsh Aggarwal, Oct 18 2024

Keywords

Comments

Positive terms must be a power of 3 or twice a power of 3. All other terms have trivial factors. No other terms under 10^7 (a(6) > 10^7).

Examples

			18 is a term because L(18)+1 = 5779 which is prime. Also 18 = 2*3^2.

Crossrefs

Indices of primes in A001612.
Cf. A000032, A000204, A001606.

A377183 Positive numbers k such that L(k)-1 is prime, where L(k) is the k-th Lucas number.

Original entry on oeis.org

2, 3, 6, 24, 48, 96
Offset: 1

Views

Author

Harsh Aggarwal, Oct 18 2024

Keywords

Comments

Terms must be 3-smooth. All other terms have trivial factors. No other terms under 10^7 (a(7) > 10^7).

Examples

			24 is a term because L(24)-1 = 103681 which is prime. Also 24 = 2^2*3^1.

Crossrefs

Indices of primes in A001610.
Cf. A000032, A000204, A001606.

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