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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A253898 Complement of A253897.

Original entry on oeis.org

1, 2, 7, 11, 13, 17, 19, 23, 25, 26, 27, 29, 31, 32, 34, 37, 38, 41, 42, 43, 46, 47, 49, 51, 52, 53, 54, 57, 58, 59, 61, 62, 64, 65, 67, 68, 69, 71, 73, 74, 76, 79, 81, 82, 83, 85, 86, 87, 89, 92, 93, 94, 95, 96, 97, 98, 100, 101, 103, 106, 107, 109, 110, 111, 113, 114, 115, 116, 118, 119
Offset: 1

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Author

Derek Orr, Jan 17 2015

Keywords

Comments

Numbers n such that the sequence A127644 with a(1) = n does not give a permutation of the natural numbers. See A127644 for more information.

Crossrefs

Programs

  • PARI
    b(r)=v=[r];n=1;while(n<100,p=prod(i=1,#v,v[i]);if(p*n\(vecsum(v)+n)==p*n/(vecsum(v)+n)&&!vecsearch(vecsort(v),n),v=concat(v,n);n=0);n++);#v
    r=1;while(r<100,if(b(r)<50,print1(r,", "));r++)
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