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.

A064899 Numbers that are of the form pq where p and q are distinct primes that are the orders of non-Abelian groups.

Original entry on oeis.org

6, 10, 14, 21, 22, 26, 34, 38, 39, 46, 55, 57, 58, 62, 74, 82, 86, 93, 94, 106, 111, 118, 122, 129, 134, 142, 146, 155, 158, 166, 178, 183, 194, 201, 202, 203, 205, 206, 214, 218, 219, 226, 237, 253, 254, 262, 274, 278, 291, 298, 301, 302, 305, 309, 314, 326
Offset: 1

Views

Author

Patrick De Geest, Oct 13 2001

Keywords

Links

Crossrefs

This is the intersection of sequences A060652 and A006881.
Cf. A001358, A064900-A064911.

Programs

  • PARI
    is(n)=my(f=factor(n)); f[,2]==[1,1]~ && f[2,1]%f[1,1]==1 \\ Charles R Greathouse IV, Oct 22 2015
  • PARI
    list(lim)=my(v=List()); forprime(q=3,lim\2,forprime(p=2,min(lim\q,q-1), if(q%p==1, listput(v,p*q)))); Set(v) \\ Charles R Greathouse IV, Oct 22 2015

Extensions

Definition corrected by Franklin T. Adams-Watters, Oct 09 2006

A089966 Numbers n such that omega(n) = gpf(n) mod spf(n), where omega=A001221, gpf=A006530 and spf=A020639.

Original entry on oeis.org

1, 15, 33, 35, 45, 51, 69, 75, 85, 87, 99, 123, 135, 141, 143, 153, 159, 161, 175, 177, 185, 207, 213, 225, 235, 245, 249, 259, 261, 267, 297, 303, 321, 323, 335, 339, 363, 369, 375, 393, 405, 411, 423, 425, 447, 455, 459, 477, 485, 501, 519, 531, 533, 535
Offset: 1

Views

Author

Reinhard Zumkeller, Nov 17 2003

Keywords

Comments

A069859(a(n)) = A001221(a(n));
A064900 is a subsequence.

Crossrefs

Cf. A089967.

A089967 Numbers n such that Omega(n) = gpf(n) mod spf(n), where Omega=A001222, gpf=A006530 and spf=A020639.

Original entry on oeis.org

1, 15, 33, 35, 51, 69, 85, 87, 123, 141, 143, 159, 161, 177, 185, 213, 235, 249, 259, 267, 303, 321, 323, 325, 335, 339, 393, 411, 447, 455, 485, 501, 519, 533, 535, 537, 553, 573, 575, 591, 635, 681, 685, 699, 715, 717, 749, 753, 771, 785, 789, 805, 807
Offset: 1

Views

Author

Reinhard Zumkeller, Nov 17 2003

Keywords

Comments

A069859(a(n)) = A001222(a(n));
A064900 is a subsequence.

Crossrefs

Cf. A089966.
Showing 1-3 of 3 results.

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

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