73151
domain: N
Appears in sequences
- Number of solenoidal flows (flow in = flow out) in a 3 X 3 square array with integer velocities -n .. n.at n=10A068722
- Number of solenoidal flows (flow in = flow out) in an n X n square array with integer velocities in -10 .. 10.at n=2A068735
- Nonprime numbers n such that phi(n) divides n^2 - 1, where phi(n) (A000010) is Euler's totient function.at n=23A098271
- Pentagonal numbers (A000326) whose digit reversal is a prime.at n=27A115707
- Pentagonal numbers with only odd digits.at n=17A117985
- Number of (w,x,y,z) with all terms in {1,...,n} and w > |x-y| + |y-z|.at n=21A212674
- Three-column array giving list of primitive triples for integer-sided triangles with A < B < C < 2*Pi/3 and such that FA, FB, FC are also integers where F is the Fermat point of the triangle.at n=16A352360
- a(n) = (A388291(n)^2 - 1)/24.at n=9A389355