30577

Properties

Appears in sequences

• q-Fibonacci numbers for q=3, scale a(n-2).at n=7A015460
• Numbers k such that the period of the continued fraction for sqrt(k) contains exactly 96 ones.at n=32A031864
• 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, 1), (-1, 0, 0), (0, 0, 1), (0, 1, 0), (1, 0, -1)}.at n=9A149893
• Numerator of Hermite(n, 5/16).at n=4A159523
• E.g.f.: A(x) = exp( Sum_{n>=1} x^(n*(n+1)/2) ).at n=8A193375
• Primes of the form (k^2+4)/5.at n=35A245042
• Triangle read by rows, giving the arithmetic progressions of prime-indexed primes in A278735.at n=12A279021
• Indices of tetrahedral numbers that are Fermat pseudoprimes to base 2.at n=4A321866
• a(n) = (prime(n) + prime(n+2))^2 + prime(n+1)^2.at n=20A348569
• a(n) = n! * Sum_{k=0..floor(n/3)} (k+1)^(k-1) / (k! * (n-3*k)!).at n=8A362523
• a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(n*j*k) / phi(n*k).at n=42A372669
• a(n) is the least prime p such that (2^p - 2)/p == n (mod p), or -1 if there is no such prime p.at n=3A377655
• Near-Wieferich primes (primes p satisfying 2^p == 2 + A*p (mod p^2)) with |A| <= 10.at n=35A385856
• Primes having only {0, 3, 5, 7} as digits.at n=44A386062
• Prime numbersat n=3301