42023

Properties

Appears in sequences

• n written in fractional base 6/4.at n=33A024637
• Primes of the form 8*k-1 such that 4*k-1 and 16*k-1 are also primes.at n=32A101792
• Indices of primes in sequence defined by A(0) = 19, A(n) = 10*A(n-1) - 61 for n > 0.at n=10A102011
• Depression-type primes with five digits; from left to right digits decrease to and increase from the central digit.at n=28A157083
• Cyclops Sophie-Germain primes.at n=29A183058
• Cyclops primes p such that 2p+1 is also a Cyclops prime.at n=14A183059
• Prime p such that sqrt(p+2) is semiprime (A001358).at n=18A257933
• T(n,k) is an array read by rows, with n > 0 and k=1..4, where row n gives four prime numbers in increasing order with locations in right angles of each concentric square drawn on a distorted version of the Ulam spiral.at n=17A271725
• Prime numbersat n=4396