24373

Properties

Appears in sequences

• Least inverse of A001390, or 0 if no inverse exists.at n=33A020638
• Primes p from A031924 such that A052180(primepi(p)) = 19.at n=18A052235
• Restricted left truncatable (Henry VIII) primes.at n=10A055521
• Starting positions of strings of three 7's in the decimal expansion of Pi.at n=25A083631
• Let n range through the odd numbers skipping multiples of 5; a(n) = n-th prime ending in n.at n=29A089779
• Recursive sequence; one more than maximum of products of pairs of previous terms with indices summing to current index.at n=24A091980
• a(1) = a(2) = a(3) = 1; for n>3, a(n) = a(n-1) + a(n-2) + a(n-3) iff n-1 is prime, otherwise a(n) = a(n-1) + 1.at n=35A113057
• Prime numbers p such that p +- ((p-1)/3) are primes.at n=22A137703
• Numbers with d digits (d>0) which have at least 2d distinct primes as substrings.at n=27A168167
• a(n) is the least integer such that the iterated modulus chain m_1=mod(a(n),m),m_2=mod(a(n),m_1),m_3=mod(a(n),m_2),..., m_n= (0 or 1) reaches a length n. The companion value m, associated to a(n), is given in A177968.at n=28A177967
• Primes with nine embedded primes.at n=11A179917
• Primes of the form 7n^2 + 6.at n=8A201607
• Primes p such that floor(log(p)) + p^2 is prime.at n=35A225626
• The prime(n)-th prime number ending in prime(n), or 0 if none exists.at n=20A238331
• Left-truncatable primes p with property that prepending any single decimal digit to p does not produce a prime.at n=12A240768
• Number of partitions p of n including round(mean(p)) as a part. (This is "Mathematica round").at n=41A241338
• Number of partitions p of n such that round(mean(p)) is a part of p; here, round(x) means floor(x + 1/2).at n=41A241733
• Number of nX4 0..1 arrays with every element equal to 0, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.at n=12A298571
• Prime numbersat n=2706