22605

Appears in sequences

• Numbers n such that 49*2^n-1 is prime.at n=23A050550
• Numbers n such that the Diophantine equation x^4+y^5=n^4 has solutions.at n=35A070756
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 1, 1), (0, 0, -1), (1, 0, 1)}.at n=10A148672
• Composites that are the sum of two, three, four and five consecutive composite numbers.at n=24A151745
• Number of (n+2) X 3 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.at n=40A184540
• Constant term in the reduction by (x^2 -> x + 1) of the polynomial C(n)*x^n, where C=A000285.at n=11A192914
• Number of n X 4 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.at n=21A201371
• The number of symmetric positive definite 2 X 2 matrices whose entries are integers of absolute value at most n.at n=28A219693
• Numbers k such that phi(k) + sigma(k) = reversal(k) + 2.at n=1A237521
• Numbers divisible by prime(d) for each digit d in their base-6 representation, none of which may be zero.at n=38A256876
• Odd numbers divisible by 3 which are neither of the form p + 3^m + 1 nor of the form p + 3^m - 1 with p prime.at n=1A282191
• Sum of the areas of all r X s rectangles such that r + s = 2n, with r, s composite.at n=37A334229