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.

A091455 Integers n such that 3*phi(n) < n that are not multiples of smaller integers with this property.

Original entry on oeis.org

30, 42, 66, 78, 102, 114, 138, 174, 186, 222, 246, 258, 282, 318, 354, 366, 402, 426, 438, 474, 498, 534, 582, 606, 618, 642, 654, 678, 762, 770, 786, 822, 834, 894, 906, 910, 942, 978, 1002, 1038, 1074, 1086, 1146, 1158, 1182, 1190, 1194, 1266, 1330
Offset: 1

Views

Author

Robert G. Wilson v, Jan 10 2004

Keywords

Crossrefs

Cf. A091454.

Programs

  • Mathematica
    a = {}; Do[ ep = EulerPhi[n]; If[ 3ep < n && Union[ Map[ IntegerQ, n/a]] != {False, True}, AppendTo[a, n]; Print[n]], {n, 1, 1361}]