24781

Properties

Appears in sequences

• Primes of form Sum_{k=1..n} (prime(k)+1).at n=37A062736
• Expansion of e.g.f.: exp( x/(1-x)^2 ).at n=6A082579
• Least k such that 10^n + k is a Sophie Germain prime and the lesser of a twin prime pair.at n=35A118580
• Binomial transform of [1, 4, 10, 20, 0, 0, 0, ...].at n=20A143131
• Primes of the form 20n^2+8n+1.at n=14A154405
• Primes p of the form 420k + 1 for some k.at n=23A217587
• a(n) = prime(prime(n^2)).at n=19A217623
• Fundamental discriminants of real quadratic number fields with class number 9.at n=29A218159
• Primes p such that floor(log(p)) + p^2 is prime.at n=39A225626
• Number of triangles, distinct up to congruence, on a centered hexagonal grid of size n.at n=12A241231
• Primes dividing nonzero terms in A003095: the iterates of x^2 + 1 starting at 0.at n=48A247981
• Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,1 0,-2 1,0 or -1,0.at n=6A264295
• T(n,k)=Number of (n+1)X(k+1) arrays of permutations of 0..(n+1)*(k+1)-1 with each element having directed index change 0,1 0,-2 1,0 or -1,0.at n=42A264299
• Centered 14-gonal (or tetradecagonal) primes.at n=12A264821
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(x/(1 - x)^k).at n=42A293012
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. exp(Sum_{j>=1} j^(k-1)*x^j).at n=42A293785
• Primes p such that (q*s-p*r)/2 and |p*s-q*r|/2 are both prime, where p,q,r,s are consecutive primes.at n=28A341802
• Triangle read by rows: T(n,s) is the numerator of the probability that the sum s occurs when repeated rolls of an n-sided die are summed for s = 0..2n.at n=32A365443
• Primes p whose index has a submultiset of their decimal digits.at n=26A365678
• Stellated octagon numbers: a(n) = 20*n^2 + 8*n + 1.at n=35A381196