A256967 a(n) = A256966(n) + 1.

1, 2, 4, 7, 10, 14, 18, 22, 27, 32, 37, 42, 47, 53, 59, 65, 71, 77, 83, 89, 95, 102, 109, 116, 123, 130, 137, 144, 151, 158, 165, 172, 179, 186, 194, 202, 210, 218, 226, 234, 242, 250, 258, 266, 274, 282, 290, 298, 306, 314, 322, 330

Offset: 1

Author

N. J. A. Sloane, Apr 16 2015

Keywords

• nonn

Links

• Chai Wah Wu, Table of n, a(n) for n = 1..10000
• Popular Computing (Calabasas, CA), A Coding Exercise (from a suggestion by R. W. Hamming), Vol. 5 (No. 54, Sep 1977), p. PC55-18. [Asks what is a(n)?]

Crossrefs

Cf. A072649, A256966.

Programs

Python

A256967_list, x, d, f1, f2 = [], 1, 1, 1, 0
for _ in range(20):
    for i in range(f1):
        A256967_list.append(x)
        x += d
    d += 1
    f1, f2 = f1 + f2, f1
# Chai Wah Wu, Apr 19 2015