122368
domain: N
Appears in sequences
- Smaller of an amicable pair: (a,b) such that sigma(a) = sigma(b) = a+b, a < b.at n=15A002025
- Scaled Chebyshev U-polynomials evaluated at sqrt(2).at n=6A057084
- Coefficient triangle of polynomials (rising powers) related to Pell number convolutions. Companion triangle is A058403.at n=27A058402
- Coefficient triangle of polynomials (falling powers) related to Pell number convolutions. Companion triangle is A058405.at n=21A058404
- Amicable numbers.at n=28A063990
- Triangle, T(n, k) = (sqrt(k+1))^(n-1)*ChebyshevU(n-1, sqrt(k+1)/2), read by rows.at n=35A167925
- Conjectured list of smallest terms of k-sociable cycles of order r.at n=25A183016
- Numbers k such that sigma(k) = sigma(sigma(k)-k).at n=32A206708
- Abundant numbers whose aliquot sequence is abundant, deficient, abundant, ..., etc.at n=20A234969
- Amicable pairs.at n=30A259180
- Amicable pairs (x < y) ordered by nondecreasing sum (x + y) and then by increasing x.at n=28A259933
- Smaller of amicable pair (x, y) as they are listed in A259933.at n=14A260086
- Amicable pairs of even numbers.at n=20A262622
- Even amicable numbers.at n=20A262624
- Twin amicable numbers (m,n) where there is not any part of another amicable pair between m and n.at n=18A273259
- Number of n X 4 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,-2) or (0,-1) and new values introduced in order 0..2.at n=6A275138
- Number of 7Xn 0..2 arrays with no element equal to any value at offset (-2,-2) (-1,-2) or (0,-1) and new values introduced in order 0..2.at n=3A275147
- Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 173", based on the 5-celled von Neumann neighborhood.at n=16A279600
- Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 435", based on the 5-celled von Neumann neighborhood.at n=16A288295
- List of pairs of amicable numbers (m,n) where the sum of the pair is divisible by 10.at n=16A291422