30763

Properties

Appears in sequences

• Primes which are a concatenation of prime(n) and n.at n=5A084669
• a(n) is the least prime for which the n-th term of the sequence S(a(n)) belongs to A007500, where each term of S(p) is the least prime >= the reversal of the previous term.at n=17A135436
• Prime numbers p such that p +- ((p-1)/3) are primes.at n=28A137703
• a(n) = Sum_{k=1..n} k*sigma(k).at n=37A143128
• Half the number of 0..n arrays of length 4 with second differences nonzero.at n=14A212783
• Number of tilings of a 7 X n rectangle using integer-sided square tiles of area > 1.at n=30A226371
• Number of partitions of n such that (number of distinct parts) >= least part.at n=39A239952
• Primes of the form 10n^2 - 90n + 163.at n=30A256376
• Primes of the form p==3 (mod 4) such that the average of their primitive roots equals p/2.at n=13A267010
• Primorial base emirps: prime numbers whose primorial base reversal is a different prime.at n=36A333425
• Numbers p that are the first of three consecutive primes p,q,r such that p*q*r-(p+q+r) and p*q*r+(p+q+r) are both in A001043.at n=4A346653
• Number of binary strings of length n in which the number of substrings 00 is one more than that of substrings 01.at n=18A370048
• Number of distinct ways of expressing n using only addition, multiplication (with all factors greater than 1), necessary parentheses, and the number 1.at n=43A373446
• Prime numbersat n=3317