87723

Appears in sequences

• Numbers n such that n divides 2^n + 1.at n=23A006521
• Numbers k such that k | 8^k + 1.at n=29A015955
• Pseudo-powers to base 3: numbers k that are not powers of 3 such that k divides 2^k + 1.at n=12A016057
• Numbers n such that n is a substring of its square in base 8 (written in base 10).at n=24A018832
• a(n) = - a(n-1) + 5(a(n-2) + a(n-3)) - 2(a(n-4) + a(n-5)) - 8(a(n-6) + a(n-7)).at n=19A090597
• Numbers n such that n divides 2^n^2 + 1.at n=32A093546
• Numbers k that divide 2^(k^3) + 1.at n=33A093665
• Numbers that factorize into a prime number of factors all raised to different prime exponents and no number appears both as an exponent and as a prime factor.at n=23A114131
• Legendre-binomial transform of 2^n for p=3.at n=16A117976
• Legendre-binomial transform of 2^n for p=3.at n=17A117976
• Product of the 5th power of a prime and different distinct prime of the 2nd power (p^5*q^2).at n=23A179646
• Composite numbers m such that (4^m - 2^m + 8*m^2 - 2) / (2*m*(2*m + 1)) is an integer.at n=7A235540
• Terms k of A006521 such that 2*k is a term of A124240.at n=23A289257
• Number of chordless cycles in the complete tripartite graph K_{n,n,n}.at n=18A297662
• a(n) = (n^3+5*n+3)/3 + 2*floor(n/2) + a(n-2), with a(0)=1 and a(1)=3.at n=37A336529
• Numbers k such that k, k + 1 and k + 2 are 3 consecutive Niven (Harshad) numbers that are also divisible by a square.at n=10A359839
• Expansion of g/(1 - x*g^6), where g = 1+x*g^5 is the g.f. of A002294.at n=6A391383