28949

Properties

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 48.at n=0A031636
• Primes with digit sum = 32.at n=26A106768
• Primes p such that (p-1)*p*(p+1)-p-2 and (p-1)*p*(p+1)+p+2 are primes.at n=29A154942
• Primes p such that 12*p^3+-1 are twin primes.at n=16A158297
• Primes q = 4*p+1, where p == 2 (mod 5) is also prime.at n=47A221981
• Number of (n+4)X7 0..2 matrices with each 5X5 subblock idempotent.at n=5A224620
• Number of (n+4) X 10 0..2 matrices with each 5 X 5 subblock idempotent.at n=2A224623
• T(n,k)=Number of (n+4)X(k+4) 0..2 matrices with each 5X5 subblock idempotent.at n=30A224625
• T(n,k)=Number of (n+4)X(k+4) 0..2 matrices with each 5X5 subblock idempotent.at n=33A224625
• Smaller member of a Sophie Germain pair in which each member of the pair is the smaller of its prime pair (p, (p*p*p)+2).at n=10A242281
• Primes that can be constructed by concatenating two squares >= 4.at n=26A345314
• Number of simple connected graphs on n unlabeled nodes with each node a member of exactly one cycle.at n=22A380632
• Primes having only {2, 4, 8, 9} as digits.at n=29A386159
• Prime numbersat n=3151