139876

Appears in sequences

• a(n) = (10*n + 4)^2.at n=37A017318
• a(n) = (11*n)^2.at n=34A017390
• a(n) = (12*n + 2)^2.at n=31A017546
• Group the triangular numbers so that the n-th group sum is a multiple of n. 1, (3, 6, 10, 15), (21), (28), (36, 45, 55, 66, 78), (91, 105, 120, 136, 153, 171, 190), ... Sequence contains the group sums.at n=33A114031
• Square perimeters of primitive Pythagorean triangles.at n=12A120089
• Squares appearing in A062064: a(n) = A062064(n) + A062064(n+1).at n=28A134537
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<=2z.at n=22A212506
• Perfect squares which can be written in all the four forms a^2+b^2, a^2+2*b^2, a^2+3*b^2 and a^2+7*b^2, with a > 0 and b > 0.at n=35A216682
• Squares which are a decimal concatenation of triprimes.at n=24A225151
• Squares which have one or more occurrences of exactly six different digits.at n=8A235721
• Primitive numbers whose abundance is positive and odd.at n=22A259231
• Squares in whose primorial base expansion only even digits appear.at n=42A328850