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A239630
Factored over the Gaussian integers, the least number having n prime factors, excluding units 1, -1, i, and -i.
2
2, 5, 10, 30, 130, 390, 2210, 6630, 46410, 192270, 1345890, 7113990, 49797930, 291673590, 2041715130
OFFSET
1,1
COMMENTS
From Amiram Eldar, Jun 27 2020: (Start)
Indices of records of A086275.
Also, numbers with a record number of unitary divisors in Gaussian integers (A332476). (End)
MATHEMATICA
nn = 12; t = Table[0, {nn}]; n = 0; found = 0; While[found < nn, n++; f = FactorInteger[n, GaussianIntegers -> True]; cnt = Length[f]; If[MemberQ[{-1, I, -I}, f[[1, 1]]], cnt--]; If[cnt <= nn && t[[cnt]] == 0, t[[cnt]] = n; found++]]; t
CROSSREFS
Cf. A001221, A001222 (integer factorizations).
Cf. A078458, A086275 (Gaussian factorizations).
Cf. A239627 (number of Gaussian factors of n, including units).
Cf. A239628 (similar to this sequence, but count all prime factors).
Cf. A239629 (number of distinct factors, including units).
Cf. A332476.
Sequence in context: A006404 A101957 A047113 * A239629 A155580 A226963
KEYWORD
nonn,more
AUTHOR
T. D. Noe, Mar 31 2014
EXTENSIONS
a(13)-a(15) from Amiram Eldar, Jun 27 2020
STATUS
approved