75777

Appears in sequences

• Numbers having four 7's in base 10.at n=12A043520
• Expansion of (1-x)^(-1)/(1+2*x^2-2*x^3).at n=25A077891
• a(1) = a(2) = 1. For n >=3, a(n) = the a(n-2)th integer, among those positive integers which are missing from the first (m-1) terms of the sequence, below a(n-1) if such a positive integer exists. Otherwise, a(n) = the a(n-2)th integer, among those positive integers which are missing from the first (m-1) terms of the sequence, above a(n-1).at n=41A118627
• 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, 1), (-1, 1, 1), (0, 0, 1), (0, 1, 1), (1, 0, -1)}.at n=9A150117
• a(n) = 74*n^2 + 1.at n=32A158742
• Numbers k such that (185*10^k + 7)/3 is prime.at n=25A281911
• Array read by rows: T(n,k) is the first number with n prime factors (counted with multiplicity) and n occurrences of decimal digit k.at n=37A375784