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A006507 a(n+1) = a(n) + sum of digits of a(n), with a(1)=7.
(Formerly M4348)
19
7, 14, 19, 29, 40, 44, 52, 59, 73, 83, 94, 107, 115, 122, 127, 137, 148, 161, 169, 185, 199, 218, 229, 242, 250, 257, 271, 281, 292, 305, 313, 320, 325, 335, 346, 359, 376, 392, 406, 416, 427, 440, 448, 464, 478, 497, 517, 530, 538, 554, 568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

a(n) = A004207(n+4) for n > 11. - Reinhard Zumkeller, Oct 14 2013

REFERENCES

Editorial Note, Popular Computing (Calabasas, CA), Vol. 4 (No. 37, Apr 1976), p. 12.

D. R. Kaprekar, Puzzles of the Self-Numbers. 311 Devlali Camp, Devlali, India, 1959.

D. R. Kaprekar, The Mathematics of the New Self Numbers, Privately Printed, 311 Devlali Camp, Devlali, India, 1963.

Jeffrey Shallit, personal communication.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

D. R. Kaprekar, The Mathematics of the New Self Numbers [annotated and scanned]

Index entries for Colombian or self numbers and related sequences

FORMULA

a(n) = A062028(a(n-1)) for n > 1. - Reinhard Zumkeller, Oct 14 2013

PROG

(Haskell)

a006507 n = a006507_list !! (n-1)

a006507_list = iterate a062028 7  -- Reinhard Zumkeller, Oct 14 2013

CROSSREFS

Cf. A016052, A007618, A016096.

Sequence in context: A232488 A070792 A178893 * A257584 A035404 A003863

Adjacent sequences:  A006504 A006505 A006506 * A006508 A006509 A006510

KEYWORD

base,nonn

AUTHOR

N. J. A. Sloane.

EXTENSIONS

More terms from Robert G. Wilson v

STATUS

approved

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Last modified September 20 12:41 EDT 2019. Contains 327237 sequences. (Running on oeis4.)