20200

Appears in sequences

• Sum of 10 nonzero 8th powers.at n=32A003388
• Numbers that are the sum of 7 positive 9th powers.at n=9A003396
• n written in fractional base 4/2.at n=40A024630
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 71.at n=27A031569
• Numbers k such that k^3 has only even digits.at n=22A052004
• Multiples of 4 whose digits add to 4.at n=20A063997
• Full Łukasiewicz word for each rooted plane tree (interpretation e in Stanley's exercise 19) encoded by A014486 (or A063171).at n=12A079436
• n, n^2 and n^3 all use only even digits.at n=11A085586
• Binary numbers with 2 replacing 1 in odd positions.at n=20A095914
• Expansion of eta(q)/eta(q^5)^5 in powers of q.at n=45A109063
• Sums of the products of n consecutive pairs of numbers.at n=24A135036
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 4 and 8.at n=25A136885
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 8.at n=40A136900
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 6 and 8.at n=30A136904
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 7 and 8.at n=34A136906
• Numbers k such that k and k^2 use only the digits 0, 2, 4 and 8.at n=17A136908
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 8 and 9.at n=27A136909
• Vertex number of a rectangular spiral related to Fibonacci numbers and prime numbers. The distances between nearest edges of the spiral that are parallel to the initial edge are the Fibonacci numbers, while the distances between nearest edges perpendicular to the initial edge are the prime numbers.at n=36A160794
• Numbers k which are concatenations k=x//y such that x^2 + y^2 is a multiple of k.at n=22A162463
• Numbers consisting of either 2's and 0's or 5's and 0's.at n=28A168541