A124140 Numbers k such that there is a bigger number m satisfying A000203(k) = A000203(m) = m + k - gcd(m,k).

24, 78, 90, 224, 260, 264, 348, 570, 728, 846, 996, 1580, 1692, 2030, 2514, 3552, 3762, 4560, 4648, 4668, 5250, 5976, 6448, 6650, 6954, 8634, 10458, 11994, 13624, 14056, 14476, 16056, 17064, 17292, 17412, 18960, 21712, 22652, 23500, 24108, 26940, 27132, 27412

Offset

1,1

Comments

R. Mathar computed this sequence up to 15000.

Links

Table of n, a(n) for n=1..43.

Example

24 is in the sequence because A000203(24) = A000203(38) = 60 = 24 + 38 - gcd(24,38).

Crossrefs

Cf. A000203, A124141.

Sequence in context: A144459 A290710 A206010 * A206003 A143839 A114818

Adjacent sequences: A124137 A124138 A124139 * A124141 A124142 A124143

Keyword

nonn

Author

Yasutoshi Kohmoto, Dec 01 2006

Extensions

Edited by Stefan Steinerberger, Aug 14 2007

Terms corrected by and more terms from Jinyuan Wang, Feb 07 2022

Status

approved