27407

Properties

Appears in sequences

• Number of bracelets (turnover necklaces) of n beads of 2 colors, 9 of them black.at n=15A032281
• Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k).at n=33A112818
• Primes of the form p = prime(k+1) such that prime(k) = (prime(k+3)+prime(k-1))/2.at n=27A126239
• Primes p such that 4*p and 6*p are each the sum of two consecutive primes.at n=40A164133
• a(n) = the first member of a twin prime pair whose sum equals the sums of n consecutive pairs of twin primes.at n=23A226719
• Primes p such that p+2, p+24 and p+246 are also primes.at n=24A235871
• Primes p such that 2*p^3 + 1 and 2*p^3 + 3 are also primes.at n=18A252042
• Primes p such that prime(p)^2 - 2 = prime(q) for some prime q.at n=29A261354
• Primes of the form 8*n^2+8*n+31.at n=42A289839
• Primes p such that 2*p+q and 2*p+r are prime, where q and r are the next two primes after p.at n=44A340225
• Primes which, when added to their reversals, produce palindromic primes.at n=44A342681
• Lesser twin primes p such that 4*p is the sum of two consecutive primes.at n=25A350736
• Triangle read by rows: T(n,k) is the number of sets of integer-sided rectangular pieces that can tile an n X k rectangle, 1 <= k <= n.at n=20A360629
• Number of sets of integer-sided rectangular pieces that can tile an n X n square.at n=5A360630
• Primes having only {0, 2, 4, 7} as digits.at n=37A386047
• Prime numbersat n=2995