30707

Properties

Appears in sequences

• Primes p such that there is no Carmichael number pqr, p<q<r q, r primes.at n=29A051663
• A list of equal temperaments (equal divisions of the octave) whose nearest scale steps are closer and closer approximations to the ratios of three complementary pairs of simple musical tones: 7/6 and 12/7, 6/5 and 5/3 and 7/5 and 10/7.at n=37A060529
• Primes p such that the p-1 digits of the binary expansion of k/p (for k=1,2,3,...,p-1) fit into the k-th row of a magic square grid of order p-1.at n=13A096339
• Orbital periods (length of year) of planets in the solar system, to the nearest whole number of terrestrial days.at n=6A116448
• Row sums of triangle A134310.at n=12A134311
• 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, -1, 1), (0, 0, -1), (0, 1, -1), (1, 0, 1)}.at n=10A148624
• Primes of the form floor(k+A000217(k-1)*Pi), Pi = A000796, k integer.at n=22A163580
• Primes that are the sum of 25 consecutive primes.at n=37A215991
• Least prime factor of (2n+1)^(2n+1)+2.at n=41A228613
• Primes p for which p^i - 4 is prime for i = 1, 3 and 5.at n=10A243818
• Primes formed by an m-digit prime concatenated with its last (m-1) digits, for m > 1.at n=15A252667
• Primes having only {0, 3, 7} as digits.at n=18A260378
• Primes whose decimal expansion is of the form d_1+0+d_2+0+d_3+0+...+0+d_k where d_i are digits with 1 <= d_i <= 9, k > 1 and + stands for concatenation.at n=41A309488
• G.f. A(x) satisfies A(x) = 1 / (1 - x - x * (1 + x + x^2 + x^3) * A(x^4)).at n=11A367657
• Primes that do not divide any 3-Carmichael numbers.at n=25A369777
• Primes having only {0, 3, 4, 7} as digits.at n=42A386058
• Primes having only {0, 3, 5, 7} as digits.at n=46A386062
• Primes having only {0, 3, 7, 8} as digits.at n=41A386067
• Prime numbersat n=3313