A186637 Semiprime powers with special exponents: k^(j-1) where both j and k are arbitrary semiprime numbers.

64, 216, 729, 1000, 1024, 2744, 3375, 7776, 9261, 10648, 15625, 17576, 35937, 39304, 42875, 54872, 59049, 59319, 65536, 97336, 100000, 117649, 132651, 166375, 185193, 195112, 238328, 262144, 274625, 328509, 405224, 456533, 537824, 551368, 614125, 636056, 658503, 753571, 759375, 804357, 830584, 857375

Offset

1,1

Comments

Semiprime analog of A036454: prime powers with special exponents: q^(p-1) where both p and q are arbitrary prime numbers.

Links

Table of n, a(n) for n=1..42.

Formula

{a(n)} = {A001358(i) ^ A186621(j)}.

{a(n)} = {a^b where a and b are elements of A001358} = {(p*q)^((r*s)-1) for primes p, q, r, s, not necessarily distinct}.

Example

a(1) = smallest semiprime to power of (smallest semiprime - 1) = 4^(4-1) = 4^3 = 64.

Crossrefs

Cf. A001358, A036454, A113877, A186621.

Sequence in context: A273321 A091077 A245991 * A295021 A194932 A016994

Adjacent sequences: A186634 A186635 A186636 * A186638 A186639 A186640

Keyword

nonn,easy

Author

Jonathan Vos Post, Feb 24 2011

Status

approved