33791

Properties

Appears in sequences

• a(n) = n^3 + n^2 - 1.at n=31A003777
• Discriminants of totally complex sextic fields (negated).at n=35A023687
• Base-9 palindromes that start with 5.at n=32A043032
• phi(s(n^3)) is a square, where s(n) is sigma(n)-n (A001065).at n=24A063798
• Start with x, xy; then concatenate each word in turn with all preceding words, getting x xy xxy xxxy xyxxy xxxxy xyxxxy xxyxxxy ...; sequence gives number of words of length n. Also binary trees by degree: x (x,y) (x,(x,y)) (x,(x,(x,y))) ((x,y),(x,(x,y)))...at n=18A063895
• Least j > 1 for n > 0 such that j^2 = (n^2 + 1)*(k^2) + (n^2 + 1)*k + 1 where k sequence = A106230.at n=32A106229
• Primes p such that p's set of distinct digits is {1,3,7,9}.at n=24A108386
• Primes p1 such that p1^3+p2^2=pp are average of twin primes. p1 and p2 consecutive primes, p1 < p2.at n=22A138735
• Smallest of 3 consecutive prime numbers such that p1*p2*p3+d1+d2+1=average of twin prime pairs, d1(delta)=p2-p1,d2(delta)=p3-p2.at n=3A153406
• 8^n+4^n-1^n.at n=5A155619
• Primes of the form 2n^2-9.at n=36A155702
• a(n) = 1024*n - 1.at n=32A158421
• Primes p such that (p+18), (p+36) and (p+72) are also prime.at n=35A175158
• Primes of the form 2^x + 2^y - 1.at n=41A188713
• Primes of the form 8n^2 - 9.at n=19A201859
• Expansion of (1-2*x)/((1+2*x)*(1-3*x)).at n=11A232015
• a(n) = n-th smallest prime congruent to 1 modulo prime(n).at n=28A234387
• Primes of the form m = 2^i + 2^j - 1, where i > j >= 0.at n=36A239712
• Decimal representation of the diagonal from the origin to the corner of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 451", based on the 5-celled von Neumann neighborhood.at n=17A288364
• Prime numbersat n=3619