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 1-2 of 2 results.

A287613 Ulam numbers u such that 5*u is also an Ulam number.

Original entry on oeis.org

36, 97, 138, 206, 358, 402, 722, 2816, 3205, 3725, 3918, 3962, 5020, 5516, 7461, 8368, 8756, 9193, 9621, 10247, 11219, 11586, 11759, 12365, 12580, 12602, 13164, 13401, 14892, 15820, 17743, 18305, 19644, 20140, 22344, 24785, 29733, 32626, 33276, 34549, 34615, 35888
Offset: 1

Views

Author

Enrique Navarrete, May 27 2017

Keywords

Comments

As in the case k=2, these are very scarce Ulam numbers u with the property that k*u is also an Ulam number (see link).

Links

Crossrefs

Cf. A002858, A068791, A285885, A287612.

A287634 Ulam numbers k such that 4*k and 16*k are also Ulam numbers.

Original entry on oeis.org

1, 324, 1296, 1858, 2630, 2814, 3451, 4905, 6366, 7258, 7322, 8754, 8966, 9980, 10655, 10779, 10909, 11881, 12248, 13609, 13917, 14769, 14904, 16502, 17281, 17303, 18923, 18943, 19598, 19852, 20284, 21342, 21904, 22012, 24367, 25425, 25814, 27607, 27908, 28729
Offset: 1

Views

Author

Enrique Navarrete, May 28 2017

Keywords

Crossrefs

Cf. A002858, A287612.

Extensions

a(11)-a(40) from Giovanni Resta, May 31 2017
Showing 1-2 of 2 results.

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