26951

Properties

Appears in sequences

• Numbers k such that k! + 1 is prime.at n=19A002981
• Primes p(k) such that the product of digits of p(k) equals the product of digits of k.at n=16A066521
• A088258 indexed by A000142.at n=39A088412
• Lower twin primes with lower twin prime index.at n=22A088460
• Primes p such that p! + 1 is also prime.at n=6A093804
• Primes p such that the number of primes less than p equal to 1 mod 4 is two less than the number of primes less than p equal to 3 mod 4.at n=36A096451
• Primes of the form 22*(n^2)+1.at n=16A117049
• Primes of the form 22*(n^2)+1 for which the sum of the digits is also of the form 22*(n^2)+1.at n=1A117050
• Primes p such that the smallest integer whose sum of decimal digits is p is prime.at n=27A129990
• a(n) = 22*n^2 + 1.at n=35A158537
• Primes p of the form 4*k+3 such that p+2 is prime and p-1 is nonsquarefree.at n=24A175606
• Number of arrays of 5 integers in -n..n with sum zero and equal numbers of elements greater than zero and less than zero.at n=10A201813
• Primes p congruent to 11 mod 12 such that (p - 1)/2 does not divide the numerator of the Bernoulli number B(p-1).at n=17A232040
• Primes p such that p+2 and q are primes, where q is concatenation of binary representations of p and p+2: q = p * 2^L + p+2, where L is the length of binary representation of p+2: L=A070939(p+2).at n=37A232238
• Numbers n such that the sum of the heptagonal numbers H(n), H(n+1) and H(n+2) is equal to the pentagonal number P(m) for some m.at n=1A252115
• Centered 22-gonal primes.at n=22A276262
• Lesser of twin primes for which phi(p-1) < phi(p+1).at n=7A286715
• Expansion of Product_{r = 1 or not a perfect power} 1/(1 - x^r).at n=46A305630
• Primes of the form p=3*q+3*r+q*r where q and r are distinct primes and 2*p-3*q, 2*p-3*r and 2*p-q*r are also prime.at n=46A328822
• Primes p whose index has a submultiset of their decimal digits.at n=28A365678