OFFSET
1,2
COMMENTS
It suffices to check only numbers with all prime factors congruent to 3 mod 4 and continuous, nonincreasing prime exponents (i.e., members of the analog of A025487 with respect to primes congruent to 3 mod 4).
LINKS
Charlie Neder, Table of n, a(n) for n = 1..277
Charlie Neder, Table of n, a(n) for n = 1..600, missing 278 and 482
EXAMPLE
a(4) = 39501 can be factored into S-primes (A057948) in 4 distinct ways: 9 * 21 * 209, 9 * 33 * 133, 9 * 57 * 77, or 21 * 33 * 57, and it is the smallest number with this property.
CROSSREFS
KEYWORD
nonn
AUTHOR
Charlie Neder, Nov 05 2018
EXTENSIONS
a(13) corrected by David A. Corneth, Nov 10 2018
More terms from WG Zeist, Jan 09 2019
STATUS
approved