A345054 Odd numbers k such that A173557(k) divides nonzero A051709(k).

27, 243, 1377, 2187, 3125, 19683, 28125, 55233, 68445, 177147, 195625, 203125, 239805, 253125, 453125, 823543, 907137, 1323297, 1378125, 1464561, 1594323, 1953125, 2278125, 3341637, 3572829, 5255361, 5877117, 9034497, 9819837, 11701053, 14348907, 17453125, 19460393, 20503125, 22209633, 26010621, 30074733, 44910045

Offset: 1

Author

Antti Karttunen, Jun 06 2021

Keywords

• nonn

Comments

Question: Are there any common terms with A345051?

Links

• Index entries for sequences where odd perfect numbers must occur, if they exist at all

Crossrefs

Odd terms in A344994.

Cf. A051709, A173557, A345051.

Programs

PARI

A051709(n) = ((sigma(n) + eulerphi(n)) - (2*n));
A173557(n) = factorback(apply(p -> p-1, factor(n)[, 1]));
isA345054(n) = if(!(n%2),0,my(u=A051709(n)); ((u>0)&&(0==(u%A173557(n)))));