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.

A076071 a(n) = A076070(n)/n.

Original entry on oeis.org

1, 16, 152, 4477, 222222469, 16851871133, 3174603192241, 127791666666937, 11370371604938421, 1234444455555556789, 93041423324151516079, 8528805556481481481499, 770180436760683760692223, 71428572222223023889697857142857
Offset: 1

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Author

Amarnath Murthy, Oct 05 2002

Keywords

Crossrefs

Extensions

More terms from David Wasserman, Mar 21 2005
a(8) corrected and a(14) from Sean A. Irvine, Mar 18 2025

A076072 Largest multiple of n that can be formed by using the digits of the next n numbers, or 0 if no such number exists.

Original entry on oeis.org

1, 32, 654, 97180, 4321111115, 987622111110, 87654322222222, 9654333333332120, 987544444443333210, 98765555555444443210, 9876666666665555524130, 988777777777776666543120, 99998888888888877654321100
Offset: 1

Views

Author

Amarnath Murthy, Oct 05 2002

Keywords

Comments

Conjecture: No entry is zero. (At least one multiple of n can be formed by using the digits of the next n numbers.)
"Next n numbers" means {1+n(n-1)/2,...,n(n+1)/2}. - M. F. Hasler, Jul 22 2011

Crossrefs

Programs

  • PARI
    precperm(p)={ my(t); forstep(i=#p-1,1,-1, p[i]>p[i+1] && for( j=1, #t=vecsort(vecextract(p,2^#p-2^(i-1)),,4), t[j]A076072(n)={ my(d=vecsort(Vec(concat(vector(n,i,Str(i+n*(n-1)/2)))),,4)); for( i=1, (#d)!, eval(concat(d))%n || break; d=precperm(d)); eval(concat(d))}  \\ M. F. Hasler, Jul 24 2011

Extensions

More terms from David Wasserman, Mar 23 2005

A076073 a(n) = A076072(n)/n.

Original entry on oeis.org

1, 16, 218, 24295, 864222223, 164603685185, 12522046031746, 1206791666666515, 109727160493703690, 9876555555544444321, 897878787878686865830, 82398148148148055545260, 7692222222222221358024700
Offset: 1

Views

Author

Amarnath Murthy, Oct 05 2002

Keywords

Crossrefs

Extensions

More terms from David Wasserman, Mar 23 2005
Showing 1-3 of 3 results.