A049052 Numbers k such that k through k+5 all have the same number of divisors.

28374, 90181, 157493, 171893, 171894, 180965, 180966, 210133, 298694, 346502, 369061, 376742, 610310, 647381, 647382, 707286, 729542, 769862, 1039493, 1039494, 1071829, 1071830, 1243541, 1302005, 1449605, 1450261, 1450262

Offset

1,1

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..1000 from Donovan Johnson)

Mathematica

SequencePosition[DivisorSigma[0, Range[1451000]], {x_, x_, x_, x_, x_, x_}][[All, 1]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Nov 03 2020 *)

Crossrefs

Cf. A000005, A006558, A019273, A119479.

Other runs of equidivisor numbers: A005237 (runs of 2), A005238 (runs of 3), A006601 (runs of 4), A049051 (runs of 5), A049053 (runs of 7).

Sequence in context: A281577 A134123 A234087 * A355712 A266039 A202614

Adjacent sequences: A049049 A049050 A049051 * A049053 A049054 A049055

Keyword

nonn

Author

David W. Wilson

Status

approved