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A194352
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First of quadruples of consecutive happy numbers.
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1
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7839, 8739, 11248, 12148, 21148, 44488, 44489, 44939, 49439, 70839, 78039, 80739, 87039, 94439, 101248, 102148, 110248, 112048, 120148, 121048, 201148, 210148, 211048, 222688, 222689, 226288, 226289, 236839, 238639, 258598, 258599, 262288, 262289, 263839
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..34.
Weisstein, Eric W.: MathWorld -- Happy Number.
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EXAMPLE
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7839, 7840, 7841, 7842 are the first of four consecutive integers each of which is a happy number, hence a(1) = 7839.
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MATHEMATICA
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f[n_] := Total[IntegerDigits[n]^2]; t = Select[Range[300000], NestWhile[f, #, UnsameQ, All] == 1 &]; t[[Select[Range[Length[t] - 3], t[[#]] == t[[# + 1]] - 1 == t[[# + 2]] - 2 == t[[# + 3]] - 3 &]]] (* T. D. Noe, Aug 22 2011 *)
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CROSSREFS
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Cf. A007770, A035502, A055629, A072494.
Sequence in context: A223361 A222339 A043520 * A045277 A099498 A045292
Adjacent sequences: A194349 A194350 A194351 * A194353 A194354 A194355
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KEYWORD
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nonn,base
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AUTHOR
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Martin Renner, Aug 22 2011
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STATUS
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approved
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