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A325311 Odd abundant numbers n for which sigma(n) == 3 (mod 4). 4
11025, 99225, 245025, 540225, 893025, 1334025, 2205225, 3980025, 4862025, 5832225, 6890625, 8037225, 8555625, 9828225, 10595025, 10989225, 12006225, 14402025, 19847025, 20385225, 24354225, 26163225, 26471025, 29648025, 31979025, 35820225, 38378025, 43758225, 46580625, 49491225, 50339025, 52490025, 55577025, 57836025, 60140025 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

These are all squares. Square roots are in A325312.

LINKS

Antti Karttunen, Table of n, a(n) for n = 1..10000

Index entries for sequences related to sigma(n)

PROG

(PARI) isA325311(n) = (n%2 && (3==sigma(n)%4) && sigma(n)>(2*n));

CROSSREFS

Cf. A000203, A324647, A325312 (square roots).

Intersection of A005231 and A324899. Subsequence of A156942.

Sequence in context: A129087 A239828 A156942 * A164518 A198208 A139409

Adjacent sequences:  A325308 A325309 A325310 * A325312 A325313 A325314

KEYWORD

nonn

AUTHOR

Antti Karttunen, Apr 20 2019

STATUS

approved

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Last modified November 19 18:39 EST 2019. Contains 329323 sequences. (Running on oeis4.)