cp's OEIS Frontend

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.

Showing 1-2 of 2 results.

A102145 Iccanobirt prime indices (15 of 15): Indices of prime numbers in A102125.

Original entry on oeis.org

4, 6, 7, 11, 30, 31, 50, 64, 77, 146, 163, 185, 210, 354, 367, 402, 3137, 3228, 3639, 11756, 22054, 23126
Offset: 1

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Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

Comments

No more terms through 5000.
a(23) > 50000. - Robert Price, Nov 11 2018

Crossrefs

Cf. A000040, A102125, A102131-A102144.

Programs

  • Mathematica
    a[n_] := a[n] =
   IntegerReverse[IntegerReverse[a[n - 1]] + IntegerReverse[a[n - 2]] +
     IntegerReverse[a[n - 3]]];
a[0] = 0; a[1] = 0; a[2] = 1;
Select[Range[0, 5000], PrimeQ[a[#]] &] (* Robert Price, Apr 10 2020 *)

Formula

A102125(a(n)) = A102165(n).

Extensions

a(20)-a(22) from Robert Price, Nov 11 2018

A102164 Iccanobirt primes (14 of 15): Prime numbers in A102124.

Original entry on oeis.org

2, 7, 31, 823, 8359081, 838645835501, 3454952325449641, 39037487994583246494995203209075812905781919221, 3849036379333595071904298941172131921008511669448798002135139108572992781805641
Offset: 1

Views

Author

Jonathan Vos Post and Ray Chandler, Dec 31 2004

Keywords

Crossrefs

Cf. A000040, A102124, A102144, A102151-A102165.

Formula

a(n) = A102124(A102144(n)).

Extensions

Offset changed to 1 by Jinyuan Wang, Aug 15 2021
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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