A337882 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, 40, 72, 160, 288, 256, 512, 2560, 2048, 6144, 30720, 24576, 122880, 147456, 737280, 1638400, 1179648, 3932160, 4718592, 21233664, 12582912, 25165824, 382205952, 67108864, 679477248, 1509949440, 805306368, 13589544960, 4831838208, 9663676416, 32212254720

Offset

3,2

Links

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

Crossrefs

Cf. A051037, A071520, A336773, A337881.

Sequence in context: A291782 A327271 A335111 * A095239 A192009 A065953

Adjacent sequences: A337879 A337880 A337881 * A337883 A337884 A337885

Keyword

nonn

Author

Hugo Pfoertner and Rainer Rosenthal, Oct 12 2020

Status

approved