68881

Properties

Appears in sequences

• Primes of the form p^k - p + 1 for prime p.at n=23A034915
• Primes with 22 as smallest positive primitive root.at n=17A061334
• Primes with either no internal digits or all internal digits are 8.at n=52A069683
• The last number for which a determinant of base-n numbers is nonzero.at n=39A079505
• Primes of the form k^3 - k + 1.at n=16A100698
• Prime numbers p such that p +- ((p-1)/8) are primes.at n=22A137771
• Prime numbers, with a(1)=2, a(n+1) = least prime such that (sum of even digits of a(n)) < (sum of even digits of a(n+1)).at n=14A158084
• Primes containing 888 as a substring.at n=4A167290
• Carryless squares of carryless primes (cf. A169887).at n=35A169904
• Greater of twin primes p such that 3*p-2 is also greater of twin primes.at n=23A177336
• Primes of the form 10n^2 - 9.at n=30A201964
• Primes p of the form p = 1 + 840*k for some k.at n=34A217862
• Number of distinct values of the sum of 3 products of three 0..n integers.at n=29A225260
• a(0) = 12, after which, if (2*a(n-1)) - 1 = product_{k >= 1} (p_k)^(c_k) then a(n) = product_{k >= 1} (p_{k-1})^(c_k), where p_k indicates the k-th prime, A000040(k).at n=43A246343
• Primes of the form (k - 1) * k * (k + 1) +- 1, k >= 1.at n=35A293861
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f.: exp(Product_{j=1..n} 1/(1+x^j) - 1).at n=63A294289
• E.g.f.: exp(1/((1+x)*(1+x^2)) - 1).at n=8A294290
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -1, a(1) = -1, a(2) = 0, a(3) = 1.at n=21A295731
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = 0, a(1) = -1, a(2) = 2, a(3) = 1.at n=21A295851
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -1, a(1) = -2, a(2) = 1, a(3) = 1.at n=20A298158