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.

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A322491 Numbers representable as truncated triangular numbers A008912 in more ways than any smaller number.

Original entry on oeis.org

1, 3, 36, 465, 1323, 9045, 38646, 117582, 334656, 1429893, 4350525, 18588606, 87223458, 265382010, 928000395, 4702917255, 5989820730, 12064005132, 56608024080
Offset: 1

Views

Author

Hugo Pfoertner, Dec 12 2018

Keywords

Comments

The corresponding numbers of representations are provided as A322492.

Examples

			a(2) = 3 because 3 is the least number occurring more than 1 time in A008867.
a(3) = 36 because 36 is the first number occurring more often (A322492(2) = 4 times) than a(2) = 3 and all numbers < 36 in A008867.

Crossrefs

Cf. A008867, A008912, A319602, A321740.

A322492 Records in the number of ways to represent a number as truncated triangular number A008912.

Original entry on oeis.org

1, 2, 4, 6, 8, 12, 16, 18, 24, 32, 36, 48, 64, 72, 96, 108, 128, 144, 192
Offset: 1

Views

Author

Hugo Pfoertner, Dec 12 2018

Keywords

Comments

The numbers where the record is first achieved are provided as A322491.

Crossrefs

Cf. A008867, A008912, A319602, A321740, A322491.

Programs

  • PARI
    v=vectorsmall(20000000);for(n=1,5100,for(k=1,n-1,my(t=n*(n-3)/2-k^2+k*n+1);v[t]++));vm=0;for(k=1,#v,if(v[k]>vm,print1(v[k],", ");vm=v[k])) \\ Hugo Pfoertner, Sep 18 2020
Showing 1-2 of 2 results.

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

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