30431

Properties

Appears in sequences

• Primes p such that p, p+18, p+36 are consecutive primes.at n=4A052189
• Triangular spiral sequence: sequence is written as a triangular spiral, each entry is the sum of the row in the previous direction containing the previous entry.at n=31A063177
• a(1) = 2, a(n+1) = smallest prime of the form a(n) + k*prime(n+1), k >1.at n=39A085041
• a(1) = 3; for n > 1 a(n) is the least prime of form a(n-1) + k*prime(n-1) with k > 0.at n=40A095184
• Row sums of triangle A101224, which is related to the Flavius sieve (A000960).at n=32A101105
• First primes of record chains of consecutive primes such that all of them are evil (A027699).at n=5A177748
• a(n) = 25*n^2 + 15*n + 1021.at n=34A214732
• Minimal natural number (in decimal representation) with n prime substrings in base-4 representation (substrings with leading zeros are considered to be nonprime).at n=21A217304
• Number of distinct values of the sum of 3 products of three 0..n integers.at n=22A225260
• Primes of the form 2*n^2+26*n+11.at n=32A243888
• Solution of the complementary equation a(n) = a(0)*b(n-1) + a(1)*b(n-2) + ... + a(n-1)*b(0), where a(0) = 2, a(1) = 3, b(0) = 1, and (a(n)) and (b(n)) are increasing complementary sequences.at n=9A296005
• Least prime p(k) such that k*p exceeds 10^n.at n=8A306586
• G.f. satisfies A(x) = Sum_{n>=0} x^(n*(n+1)/2) * A(x)^(n*(n+1)).at n=9A384829
• Prime numbersat n=3287