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

1,1

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

Mathematica

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

Crossrefs

The unitary version of A231964.

Cf. A063948.

Sequence in context: A046476 A263429 A175309 * A335304 A193888 A361312

Adjacent sequences: A357320 A357321 A357322 * A357324 A357325 A357326

Keyword

nonn

Author

Amiram Eldar, Sep 24 2022

Status

approved