A179884 List of twin numbers (h, h+1) such that h and h+1 have same antiharmonic mean of the numbers k < h such that gcd(k, h) = 1 and simultaneously this mean is an integer.

1, 2, 10, 11, 22, 23, 46, 47, 58, 59, 82, 83, 106, 107, 166, 167, 178, 179, 226, 227, 262, 263, 265, 266, 346, 347, 358, 359, 382, 383, 454, 455, 466, 467, 469, 470, 478, 479, 493, 494, 502, 503

Offset

1,2

Comments

Subsequence of A179883 and A179871. Antiharmonic mean B(h) of numbers k such that gcd(k, h) = 1 for numbers h >= 1 and k < h = A053818(n) / A023896(n) = A175505(h) / A175506(h). Corresponding values of antiharmonic mean B(a(n)) in A179886.

Links

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

Crossrefs

Cf. A179871, A179872, A179873, A179874, A179875, A179876, A179877, A179878, A179879, A179880, A179882, A179883, A179885, A179886, A179887, A179890, A179891.

Sequence in context: A069263 A356520 A174569 * A174570 A374597 A072545

Adjacent sequences: A179881 A179882 A179883 * A179885 A179886 A179887

Keyword

nonn

Author

Jaroslav Krizek, Jul 30 2010, Jul 31 2010

Status

approved