A348743 Odd nonsquares k for which A161942(k) > k, where A161942 is the odd part of sigma.

2205, 19845, 108045, 143325, 178605, 187425, 236925, 266805, 319725, 353925, 372645, 407925, 452025, 462825, 584325, 637245, 646425, 658125, 672525, 789525, 796005, 804825, 845325, 920205, 972405, 981225, 1007325, 1055925, 1069425, 1102725, 1113525, 1116225, 1166445, 1201725, 1245825, 1289925, 1378125, 1380825, 1442925

Offset

1,1

Comments

Not all terms are multiples of 5. For example, 6243237 and 8164233 are not.

Links

Table of n, a(n) for n=1..39.

Index entries for sequences related to sigma(n)

Prog

(PARI)
A000265(n) = (n >> valuation(n, 2));
isA348743(n) = ((n%2)&&!issquare(n)&&A000265(sigma(n))>n);

Crossrefs

Intersection of A088828 and A348742.

Cf. A161942, A348741.

Sequence in context: A075455 A233444 A125015 * A252397 A252392 A175915

Adjacent sequences: A348740 A348741 A348742 * A348744 A348745 A348746

Keyword

nonn

Author

Antti Karttunen, Nov 02 2021

Status

approved