A342281 A bisection of A001951: a(n) = A001951(2*n+1).

1, 4, 7, 9, 12, 15, 18, 21, 24, 26, 29, 32, 35, 38, 41, 43, 46, 49, 52, 55, 57, 60, 63, 66, 69, 72, 74, 77, 80, 83, 86, 89, 91, 94, 97, 100, 103, 106, 108, 111, 114, 117, 120, 123, 125, 128, 131, 134, 137, 140, 142, 145, 148, 151, 154, 156, 159, 162, 165, 168

Offset

0,2

Links

Table of n, a(n) for n=0..59.

N. J. A. Sloane, Families of Essentially Identical Sequences, Mar 24 2021 (Includes this sequence)

Prog

(Python)
from sympy import integer_nthroot
def A342281(n): return integer_nthroot(8*n*(n+1)+2, 2)[0] # Chai Wah Wu, Mar 16 2021

Crossrefs

Cf. A001951, A022842.

Sequence in context: A080902 A285210 A356056 * A310953 A284796 A310954

Adjacent sequences: A342278 A342279 A342280 * A342282 A342283 A342284

Keyword

nonn

Author

N. J. A. Sloane, Mar 16 2021

Extensions

More terms from Alois P. Heinz, Mar 16 2021

Status

approved