23327

Properties

Appears in sequences

• Class 1+ primes: primes of the form 2^i*3^j - 1 with i, j >= 0.at n=28A005105
• Number of numbers up to 10^n with exactly 4 divisors.at n=4A035533
• Second member of a sexy prime quadruple: value of p+6 such that p, p+6, p+12 and p+18 are all prime.at n=37A046122
• A generalized difference set on the set of all integers (lambda = 2).at n=25A049399
• Prime number spiral (clockwise, Northwest spoke).at n=25A053999
• Second term of balanced prime quartets: p(m)-p(m-1) = p(m+1)-p(m) = p(m+2)-p(m+1).at n=15A054801
• Smallest prime p such that x = n is a solution mod p of x^3 = 2, or 0 if no such prime exists.at n=34A059940
• Primes with every digit a prime and the sum of the digits a prime.at n=37A062088
• Smaller of a pair of consecutive primes having only prime digits.at n=13A082755
• Primes produced by repeated application of the formula p -> (10p +- 3) starting at the prime 2.at n=16A086322
• Primes of the form 8*k^2 - 1.at n=24A090684
• Primes with a prime number of digits, all of them prime, that add up to a prime.at n=12A110028
• Number of terms in s(n), where s(n) is defined in A114483.at n=16A112361
• Smallest prime p such that p == 1 (mod prime(n)) and not p == 1 (mod k) for 2 < k < prime(n).at n=27A116605
• Let p be an element of A110028. Let L(p) be the sorted list of digits of p and let LL be the set of all L(p) with duplicates removed and ordered lexicographically. Then a(n) is the first element of A110028 such that L(a(n))=LL(n).at n=9A117608
• Primes with prime number of only prime digits (i.e., 2, 3, 5, 7).at n=25A124888
• Number of valley-avoiding compositions with positive parts.at n=17A128805
• a(n) = numerator of the sum of reciprocals of those positive integers which are <= n and are not among earlier terms of A130502.at n=15A130502
• a(n) = 18*n^2 - 1.at n=35A157910
• Primes p0 such that p0+p1+p2-+2 are primes; p0,p1,p2 are three consecutive primes.at n=26A158351