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A006378 Prime self (or Colombian) numbers: primes not expressible as the sum of an integer and its digit sum.
(Formerly M2427)
8
3, 5, 7, 31, 53, 97, 211, 233, 277, 367, 389, 457, 479, 547, 569, 613, 659, 727, 839, 883, 929, 1021, 1087, 1109, 1223, 1289, 1447, 1559, 1627, 1693, 1783, 1873, 2099, 2213, 2347, 2437, 2459, 2503, 2549, 2593, 2617, 2683, 2729, 2819, 2953, 3023, 3067 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

(Haskell)

a006378 n = a006378_list !! (n-1)

a006378_list = map a000040 $ filter ((== 0) . a107740) [1..]

-- Reinhard Zumkeller, Sep 27 2014

REFERENCES

M. Gardner, Time Travel and Other Mathematical Bewilderments. Freeman, NY, 1988, p. 116.

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

D. R. Kaprekar, The Mathematics of the New Self Numbers (Part V). 311 Devlali Camp, Devlali, India, 1967.

Jeffrey Shallit, personal communication c. 1999.

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

LINKS

Donovan Johnson, Table of n, a(n) for n = 1..10000

B. Recamán, Problem E2408, Amer. Math. Monthly, 81 (1974), p. 407.

T. Trotter, Charlene Numbers

Index entries for Colombian or self numbers and related sequences

FORMULA

A107740(A049084(a(n))) = 0.

MATHEMATICA

With[{nn=3200}, Complement[Prime[Range[PrimePi[nn]]], Table[n+Total[ IntegerDigits[n]], {n, nn}]]] (* Harvey P. Dale, Dec 30 2011 *)

CROSSREFS

Cf. A003052, A007953, A047791, A048521, A062028.

Cf. A000040, A107740, A049084.

Sequence in context: A106920 A060273 A124077 * A162714 A002396 A029508

Adjacent sequences:  A006375 A006376 A006377 * A006379 A006380 A006381

KEYWORD

nonn,base,nice,easy

AUTHOR

N. J. A. Sloane

EXTENSIONS

Formula corrected by Reinhard Zumkeller, Sep 27 2014

STATUS

approved

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Last modified October 24 04:36 EDT 2014. Contains 248499 sequences.