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A256967 a(n) = A256966(n) + 1. 3
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

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)?]

PROG

(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

CROSSREFS

Cf. A072649, A256966.

Sequence in context: A130251 A276208 A225635 * A225249 A214048 A088236

Adjacent sequences:  A256964 A256965 A256966 * A256968 A256969 A256970

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Apr 16 2015

STATUS

approved

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Last modified October 22 04:25 EDT 2019. Contains 328315 sequences. (Running on oeis4.)