a(n) is the least k such that in the prime power factorization of k! the exponents of primes p_1, ..., p_n are odd, while the exponent of p_(n+1) is even.
A321362
a(n) is the least k such that in the prime power factorization of k! the exponents of primes p_1, ..., p_n are odd, while the exponent of p_(n+1) is even.
Terms
- a(0) =2a(1) =3a(2) =5a(3) =119a(4) =57a(5) =220a(6) =1131a(7) =2986a(8) =1505a(9) =3211a(10) =21300a(11) =26795a(12) =11820a(13) =14575a(14) =67385a(15) =221051a(16) =33782a(17) =132512a(18) =819236a(19) =1478432a(20) =1630903a(21) =26736550a(22) =1095752a(23) =41815849a(24) =24813938a(25) =31982450a(26) =142574286a(27) =860986855a(28) =602660826a(29) =2638930495
External references
- oeis: A321362