A077667 Triangle read by rows. Let k = n-th composite number. The n-th row gives k smallest numbers unrelated to k (numbers which do not divide k, are not divisible by k and are not coprime to k).

6, 10, 14, 18, 4, 8, 9, 10, 14, 15, 6, 10, 12, 14, 18, 20, 22, 26, 6, 12, 15, 21, 24, 30, 33, 39, 42, 4, 6, 8, 12, 14, 15, 16, 18, 22, 24, 8, 9, 10, 14, 15, 16, 18, 20, 21, 22, 26, 27, 4, 6, 8, 10, 12, 16, 18, 20, 21, 22, 24, 26, 30, 32, 6, 9, 10, 12, 18, 20, 21, 24, 25, 27, 33

Offset

1,1

Comments

Primes do not have unrelated numbers.

Links

Table of n, a(n) for n=1..74.

Example

The first few rows are:
  6, 10, 14, 18;
  4,  8,  9, 10, 14, 15;
  6, 10, 12, 14, 18, 20, 22, 26;
  6, 12, 15, 21, 24, 30, 33, 39, 42;
  ...
For 1st row, 4 is the 1st composite and 6, 10, 14, 18 do not divide 4, are not divisible by 4 and are not coprime to 4.

Crossrefs

Cf. A077668, A077669.

Sequence in context: A315167 A315168 A167200 * A284945 A091577 A115036

Adjacent sequences: A077664 A077665 A077666 * A077668 A077669 A077670

Keyword

nonn,tabf,less

Author

Amarnath Murthy, Nov 15 2002

Extensions

Corrected and extended by Sascha Kurz, Jan 27 2003

Offset corrected by Mohammed Yaseen, Oct 18 2023

Status

approved