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.

A291199 Primes p such that phi(p*(p+1)/2) is a triangular number (A000217).

Table of values

n a(n)
1 2477
2 44287823
3 58192759
4 110369351
5 664009019
6 2574106333
7 6870260119
8 7423240007
9 60370077539
10 188271042191
11 235399729007
12 236767359977
13 305214702643
14 717724689959

List of values

[2477, 44287823, 58192759, 110369351, 664009019, 2574106333, 6870260119, 7423240007, 60370077539, 188271042191, 235399729007, 236767359977, 305214702643, 717724689959]