21611

Properties

Appears in sequences

• Primes p such that p+1 is palindromic.at n=31A028981
• Sum of composite numbers between prime p and nextprime(p) is palindromic.at n=22A054266
• Primes of the form k^2 + 2.at n=16A056899
• Primes which can be expressed as concatenation of powers of 6 and 0's.at n=24A066597
• Primes of the form m^k+k, with m and k > 1.at n=21A099227
• Prime numbers p such that p+6, p^2+6^2, p^4+6^4 are all primes.at n=13A107441
• Primes with digital product = 12.at n=15A107697
• Primes in the sequence a(n)=n^2+3/2-1/2*(-1)^n.at n=41A125557
• a(n) = floor(((1+sqrt(3))/2)^n).at n=31A125895
• A monotonic doubly-fractal sequence. Erase the last (rightmost) digit of every integer: what is left is the sequence itself. The erased digits, one by one, form also the sequence itself.at n=37A127204
• Primes that are equal to the mean of 5 consecutive squares.at n=14A129388
• Primes congruent to 17 mod 61.at n=38A142815
• Primes of the form 9*(p^4)-2 or 9*(p^4)+2, arising in Paley-Hadamard difference sets.at n=2A157430
• Primes p such that the differences between p and the closest squares surrounding p are primes.at n=21A163848
• Primes of the form 2*n^2 + 74*n + 35.at n=11A217500
• Number of partitions of n for which (number of occurrences of the least part) = (number of occurrences of greatest part).at n=46A236543
• Lesser of consecutive primes whose average is a palindromic number.at n=35A242387
• Initial members of prime quadruples (n, n+2, n+36, n+38).at n=21A248367
• Lesser of twin primes of the form (k^2 + 2, k^2 + 4).at n=7A253639
• Primes p such that (p mod s) and (p mod t) are consecutive primes, where s is the sum of the digits of p and t is the product of the digits of p.at n=22A344127