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

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

1,1

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

Table of n, a(n) for n=1..42.

Enrique Navarrete, Relative Frequencies of Multiples of Ulam Numbers

Crossrefs

Cf. A002858, A068791, A285885, A287612.

Sequence in context: A324297 A250785 A057392 * A118632 A260007 A306213

Adjacent sequences: A287610 A287611 A287612 * A287614 A287615 A287616

Keyword

nonn

Author

Enrique Navarrete, May 27 2017

Status

approved