71145
domain: N
Appears in sequences
- Larger of amicable pair.at n=10A002046
- Expansion of x/(1 - 9*x - 4*x^2).at n=6A015580
- Odd integers m such that phi(m) | sigma(m).at n=24A015715
- Amicable numbers.at n=21A063990
- Numbers n such that the arithmetic, geometric and harmonic means of phi(n) and sigma(n) are all integers.at n=27A065146
- Numbers k such that sigma(k) = 4*phi(k).at n=21A068390
- Numbers k such that sigma(k) = phi(k)*omega(k).at n=15A073567
- Numbers k such that both k and 2*k are balanced numbers (A020492).at n=36A076375
- Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).at n=17A076376
- Numbers k such that k, 2*k, 4*k and 8*k are balanced numbers (A020492).at n=5A076377
- Larger member of an infinitary amicable pair.at n=14A126170
- Infinitary amicable numbers.at n=29A127664
- List of numbers which are both amicable and friendly.at n=2A140688
- Largest members of k-sociable cycles of order r.at n=18A183013
- Conjectured list of multisociable numbers.at n=34A183019
- Numbers k such that sigma(k) = sigma(sigma(k)-k).at n=25A206708
- Deficient numbers whose aliquot sequence is deficient, abundant, deficient, ..., etc.at n=17A234970
- Let us denote 's' the sum of the deficient numbers in the aliquot parts of x. Sequence lists numbers x such that sigma(s)-s is equal to x.at n=19A254879
- Amicable pairs.at n=21A259180
- Amicable pairs (x < y) ordered by nondecreasing sum (x + y) and then by increasing x.at n=19A259933