30890

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 11.at n=35A031599
• Index k of the first occurrence of A019565(2n-1) as the smallest term that makes prime(k)-A019565(2n-1) prime.at n=38A103792
• Second differences of sequence A160644.at n=43A160648
• a(n) is the position of the first occurrence of n^3 in the concatenation of the positive integers in decimal representation.at n=19A290787
• Number of self-avoiding planar walks starting at (0,0), ending at (n,0), remaining in the first quadrant and using steps (0,1), (1,0), (1,1), (-1,1), and (1,-1) such that (0,1) is never used directly before or after (1,0) or (1,1).at n=6A317985
• G.f.: Sum_{n>=0} x^n * (1 + x^n)^n / (1 - x + x^(n+1))^(n+1).at n=15A322619
• a(n) is the initial transient (converted to base 10), before the periodic part, on the n-th diagonal from the left of rule-30 1-D cellular automaton, when started from a single ON cell, or -1 if there is no transient part.at n=25A364241