6359661domain: NAppears in sequencesa(n) is the least number with n factorizations into S-primes (numbers 4k+1 with no proper divisors > 1 of form 4m+1).at n=15A321337Where the number of divisors d(k) reaches a new record for numbers k whose prime factors are of the form 4*j+3.at n=20A326313