31531

Properties

Appears in sequences

• Primes such that the sum of the squares of its digits is equal to the product of its digits.at n=6A067779
• Expansion of (1-x)^(-1)/(1-2*x-3*x^2-2*x^3).at n=9A077826
• Decimal Goedelization of antitheorems from propositional calculus, in Richard C. Schroeppel's metatheory of A101273.at n=22A100200
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 0, 0), (1, -1, 0), (1, 1, 0)}.at n=9A149514
• Erroneous version of A100200.at n=11A151996
• Let a(1)=1; for n>1 a(n)=nextprime(a(n-1)+(a(n-1)+1)/4).at n=38A175953
• Larger of emirp pairs whose digital sums are also emirps (A178091).at n=40A178093
• Number of third differences of arrays of length 5 of numbers in 0..n.at n=29A228261
• Primes of the form abcabc..abcab.at n=26A228627
• Number of (1+1) X (n+1) arrays of permutations of 0..n*2+1 filled by rows with each element moved a city block distance of 0 or 2, and rows and columns in increasing lexicographic order.at n=16A263603
• Emirps p such that (p*q) mod (p+q) is also an emirp, where q is the digit reversal of p.at n=35A355651
• Prime numbersat n=3393