The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A239629 Factored over the Gaussian integers, the least positive number having n prime factors, including units -1, i, and -i. 2
 1, 2, 5, 10, 30, 130, 390, 2730, 13260, 64090, 192270, 1345890, 7113990, 49797930, 291673590, 2041715130 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Here -1, i, and -i are counted as factors. The factor 1 is counted only in a(1). Indices of records of A239627. - Amiram Eldar, Jun 27 2020 LINKS MATHEMATICA 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 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. A239630 (number of distinct factors, excluding units). Sequence in context: A101957 A047113 A239630 * A155580 A226963 A018386 Adjacent sequences:  A239626 A239627 A239628 * A239630 A239631 A239632 KEYWORD nonn,more AUTHOR T. D. Noe, Mar 31 2014 EXTENSIONS a(14)-a(16) from Amiram Eldar, Jun 27 2020 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 20 13:08 EDT 2021. Contains 345164 sequences. (Running on oeis4.)