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A033870 Divisors = 1 (mod 4) of Descartes's 198585576189. 4
1, 9, 13, 21, 33, 49, 57, 61, 77, 117, 121, 133, 169, 209, 273, 361, 429, 441, 549, 637, 693, 741, 793, 1001, 1089, 1197, 1281, 1521, 1573, 1617, 1729, 1881, 2013, 2541, 2717, 2793, 2989, 3249, 3477, 3549, 4389, 4693, 4697, 5577, 5733, 5929 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

The number 198585576189 has 486 divisors, 246 of which are congruent to 1 modulo 4. - M. F. Hasler, Feb 17 2017

LINKS

M. F. Hasler, Table of n, a(n) for n = 1..246

EXAMPLE

198585576189 = 3^2 * 7^2 * 11^2 * 13^2 * 19^2 * 61.

PROG

(PARI) lista() = {fordiv(198585576189, d, if (d % 4 == 1, print1(d, ", "))); } \\ Michel Marcus, Jul 14 2013

(PARI) select(d->d%4==1, divisors(198585576189)) \\ M. F. Hasler, Feb 17 2017

CROSSREFS

Cf. A033871, A222262.

Sequence in context: A304259 A124249 A137168 * A151901 A157199 A291351

Adjacent sequences:  A033867 A033868 A033869 * A033871 A033872 A033873

KEYWORD

easy,fini,nonn,full

AUTHOR

Naohiro Nomoto

EXTENSIONS

Corrected by Michel Marcus, Jul 14 2013

STATUS

approved

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Last modified June 20 12:57 EDT 2021. Contains 345164 sequences. (Running on oeis4.)