138601

Appears in sequences

• Smallest number that is centered polygonal in exactly n ways.at n=20A063773
• a(1) = 1, a(n) = smallest triangular number of the form k*a(n-1) + 1 for some positive integer k.at n=7A068082
• Composite numbers k such that k divides F(k-1) where F(j) are the Fibonacci numbers.at n=30A069106
• Numbers k that divide Fibonacci(k-1) but do not divide Fibonacci(k) - 1.at n=15A094410
• Sieve performed by successive iterations of steps where step m is: keep m terms, remove the next 4 and repeat; as m = 1,2,3,.. the remaining terms form this sequence.at n=20A112562
• Number of 2 X n 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.at n=32A224000
• Triangular numbers representable as triangular(x)*triangular(y)+1.at n=22A226389
• a(n) = the least integer that is centered polygonal in exactly n ways.at n=19A279830