A357323 Numbers k such that k and k+2 are both unitary untouchable numbers (A063948).

2, 3, 5, 30756, 34182, 46128, 51816, 56352, 72522, 86640, 88896, 119796, 133062, 133618, 149682, 164290, 207282, 207642, 213636, 245708, 257820, 261156, 279730, 283050, 286356, 286858, 310842, 318060, 327300, 339402, 339612, 349030, 360390, 371820, 377940, 384576, 396090

Offset: 1

Author

Amiram Eldar, Sep 24 2022

Keywords

• nonn

Comments

Except for k=3, are there any other numbers k such that k, k+2 and k+4 are all unitary untouchable numbers? There are no such numbers below 10^6.

Links

• Amiram Eldar, Table of n, a(n) for n = 1..101

Crossrefs

The unitary version of A231964.

Cf. A063948.

Programs

Mathematica

u = Cases[Import["https://oeis.org/A063948/b063948.txt", "Table"], {, }][[;; , 2]]; Select[u, MemberQ[u, # + 2] &]