101601

Appears in sequences

• Row sums of triangle A132056 (S2(8), Stirling2 generalization).at n=4A132060
• Number of arrays of 2n nondecreasing integers in -4..4 with sum zero and equal numbers greater than zero and less than zero.at n=15A203287
• a(n) is the least k such that phi(k) + d(k) = 2^n, or -1 if there is no such k, where phi(k) = A000010(k) is Euler's totient function and d(k) = A000005(k) is the number of divisors of k.at n=15A357898