4 = 12 − 34 − 56 − 7 + 89
4 = 98 − 7 − 65 − 43 + 21
4 = 0^4 + 1^6 − 2^8 − 3^9 + 4^7 + 5^5 + 6^0 + 7^3 + 8^1 + 9^2
Number that is the sum of 4 positive 5th powers.
Number k such that (7x10^k + 71)/3 is prime
Numbers k such that k^4 + 1 is prime. (257)
Numbers k such that (35*10^k - 11)/3 is prime (116663)
Number k such that (16*10^k - 31)/3 is prime.
Numbers k such that (8*10^k + 49)/3 is prime.
Number of regions formed inside a square with edge length 1 by the straight line segments mutually connecting all vertices and points that divide the sides into segments with lengths equal to the Farey series of order 1
Number of ways of arranging 3 lines in the affine plane.
Number of squarefree graphs on 3 vertices
5 = Integer partitions of 4
Moser-de Bruijn sequence: sums of distinct powers of 4
Numbers k such that k^2 divides 9^k - 1 (6560)
Cake number, maximal number of pieces resulting from 2 planar cuts through a cube (or cake)
Numbers of edges of regular polygon constructible with unmarked straightedge and compass.
Number of distinct products i*j*k for 1 <= i <= j < k <= n, n = 3
Representations, Binary to Hexadecimal:
100_2
11_3
10_4
4_5
4_6
4_7
4_8
4_9
4_11
4_12
4_13
4_14
4_15
4_16
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
