cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A239629 Factored over the Gaussian integers, the least positive number having n prime factors, including units -1, i, and -i.

This page as a plain text file.
%I A239629 #9 Jun 27 2020 04:31:39
%S A239629 1,2,5,10,30,130,390,2730,13260,64090,192270,1345890,7113990,49797930,
%T A239629 291673590,2041715130
%N A239629 Factored over the Gaussian integers, the least positive number having n prime factors, including units -1, i, and -i.
%C A239629 Here -1, i, and -i are counted as factors. The factor 1 is counted only in a(1).
%C A239629 Indices of records of A239627. - _Amiram Eldar_, Jun 27 2020
%t A239629 nn = 12; t = Table[0, {nn}]; n = 0; found = 0; While[found < nn, n++; cnt = Length[FactorInteger[n, GaussianIntegers -> True]]; If[cnt <= nn && t[[cnt]] == 0, t[[cnt]] = n; found++]]; t
%Y A239629 Cf. A001221, A001222 (integer factorizations).
%Y A239629 Cf. A078458, A086275 (Gaussian factorizations).
%Y A239629 Cf. A239627 (number of Gaussian factors of n, including units).
%Y A239629 Cf. A239628 (similar to this sequence, but count all prime factors).
%Y A239629 Cf. A239630 (number of distinct factors, excluding units).
%K A239629 nonn,more
%O A239629 1,2
%A A239629 _T. D. Noe_, Mar 31 2014
%E A239629 a(14)-a(16) from _Amiram Eldar_, Jun 27 2020