A337881 30*a(n) - 1 is the least prime of the form 2^r*3^s*5^t - 1, r > 0, s > 0, t > 0, r + s + t = n.

1, 2, 6, 8, 16, 48, 96, 432, 384, 512, 2304, 4608, 23040, 8192, 24576, 49152, 65536, 294912, 655360, 1310720, 2621440, 10616832, 6291456, 28311552, 62914560, 75497472, 251658240, 838860800, 402653184, 805306368, 1073741824, 12079595520, 14495514624, 65229815808

Offset

3,2

Links

Hugo Pfoertner, Table of n, a(n) for n = 3..1000

Crossrefs

Cf. A051037, A071520, A336773, A337882.

Sequence in context: A238549 A237502 A279726 * A331974 A137848 A182629

Adjacent sequences: A337878 A337879 A337880 * A337882 A337883 A337884

Keyword

nonn

Author

Hugo Pfoertner and Rainer Rosenthal, Oct 12 2020

Status

approved