A143244 a(n) = the smallest multiple of the n-th prime such that (a(n)-1) is divisible by both the (n-1)th prime and the (n+1)st prime.

21, 85, 56, 638, 936, 3706, 4693, 552, 12122, 13950, 21608, 57277, 52030, 4559, 77645, 16166, 221369, 60635, 44020, 375804, 339305, 316396, 104664, 844967, 379659, 140492, 752210, 495732, 1536574, 1376680, 1235330, 1456721, 142892

Offset

2,1

Links

Table of n, a(n) for n=2..34.

Mathematica

a[n_]:=Module[{i=1}, Until[Divisible[p-1, Prime[n-1]]&&Divisible[p-1, Prime[n+1]], i++; p=Prime[n]*i]; p]; Array[a, 33, 2] (* James C. McMahon, Aug 19 2025 *)

Crossrefs

Cf. A143243.

Sequence in context: A071397 A064762 A104676 * A041856 A044208 A044589

Adjacent sequences: A143241 A143242 A143243 * A143245 A143246 A143247

Keyword

nonn

Author

Leroy Quet, Aug 01 2008

Extensions

Extended by Ray Chandler, Aug 08 2008

Status

approved