A363458 Numbers k such that k and k+1 are both in A363457.

1, 54, 242883, 246962, 261643, 266001, 353893, 380287, 425818, 457055, 542950, 581942, 595440, 831264, 917311, 980235, 1256341, 1719654, 6239931, 8237549, 8378312, 10995744, 11650985, 15123420, 15194370, 15442721, 19628056, 20034738, 20308106, 26218271, 36099782

Offset

1,2

Comments

Numbers k such that A025487(k) and A025487(k+1) are both products of distinct primorial numbers (A002110), i.e., both terms of A129912.

The corresponding values of A025487(k) are 1, 2310, 22841771267013565192326000, 26648733144849159391047000, ..., and the corresponding values of A025487(k+1) are 2, 2520, 22842063073200641551281000, 26649458453137387177510200, ... .

Links

Table of n, a(n) for n=1..31.

Example

54 is a term since A025487(54) = 2310 and A025487(55) = 2520 are both products of distinct primorial numbers: 2310 = 2 * 3 * 5 * 7 * 11 and 2520 = 2 * (2 * 3) * (2 * 3 * 5 * 7).

Crossrefs

Cf. A002110, A025487, A129912, A363457.

Sequence in context: A093254 A347061 A151635 * A218430 A159732 A174946

Adjacent sequences: A363455 A363456 A363457 * A363459 A363460 A363461

Keyword

nonn

Author

Amiram Eldar, Jun 03 2023

Status

approved