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 1-3 of 3 results.

A285809 Primes equal to a centered triangular number plus 1.

Original entry on oeis.org

2, 5, 11, 47, 137, 167, 317, 461, 761, 977, 1307, 1787, 2111, 2711, 3677, 4457, 5861, 7247, 7457, 9011, 10211, 13397, 15761, 17987, 22511, 23627, 43607, 45677, 54437, 56747, 58511, 61511, 63347, 65837, 66467, 79697, 82487, 88211, 90407, 93377, 97157, 108947
Offset: 1

Views

Author

Colin Barker, Apr 27 2017

Keywords

Links

Crossrefs

Cf. A000040, A005448, A285810, A285811, A285812.

Programs

  • PARI
    cpg(m, n) = m*n*(n-1)/2+1 \\ n-th centered m-gonal number
maxk=600; L=List(); for(k=1, maxk, if(isprime(p=cpg(3, k) + 1), listput(L, p))); Vec(L)

A285810 Primes equal to a centered pentagonal number plus 1.

Original entry on oeis.org

2, 7, 17, 107, 227, 277, 457, 857, 1627, 3517, 4517, 5407, 9767, 11057, 13877, 15017, 16607, 20477, 23767, 26267, 27827, 35107, 37517, 41927, 42577, 50767, 53657, 58907, 62017, 68477, 79657, 83267, 86027, 93607, 98507, 110777, 113957, 128257, 137477, 145807
Offset: 1

Views

Author

Colin Barker, Apr 27 2017

Keywords

Links

Crossrefs

Cf. A000040, A005891, A285809, A285811, A285812.

Programs

  • PARI
    cpg(m, n) = m*n*(n-1)/2+1 \\ n-th centered m-gonal number
maxk=600; L=List(); for(k=1, maxk, if(isprime(p=cpg(5, k) + 1), listput(L, p))); Vec(L)

A285811 Primes equal to a centered heptagonal number plus 1.

Original entry on oeis.org

2, 23, 107, 149, 317, 1619, 2459, 3257, 3929, 5189, 6029, 6323, 7247, 15017, 19427, 21023, 21569, 26189, 42737, 45887, 55127, 56009, 63317, 66173, 67139, 70079, 82469, 101747, 105359, 110273, 125687, 136523, 137909, 149249, 155087, 159539, 167099, 171719
Offset: 1

Views

Author

Colin Barker, Apr 27 2017

Keywords

Comments

Primes in A209294. - Omar E. Pol, Apr 27 2017

Links

Crossrefs

Cf. A000040, A069099, A285809, A285810, A285812.

Programs

  • PARI
    cpg(m, n) = m*n*(n-1)/2+1 \\ n-th centered m-gonal number
maxk=600; L=List(); for(k=1, maxk, if(isprime(p=cpg(7, k) + 1), listput(L, p))); Vec(L)
Showing 1-3 of 3 results.

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

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