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Search: id:A138850
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| 836, 7192, 7912, 9272, 10792, 17272, 45356, 73616, 83312, 91388, 113072, 222952, 243892, 254012, 338572, 343876, 351956, 388076, 407132, 410476, 465652, 470668, 475684, 477356, 482372, 490732, 495748, 500764, 502436, 507452, 512468, 515812
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Up to 200000, there are only 11 weird numbers not divisible by 5.
Since no A006037(k) < 10^17 is odd, at least up to there, "divisible by 5" is equivalent to "ending in 0" (in base 10).
It appears that 4*11*19*p is an element of this sequence for p=1 and all primes p>547. Moreover, these seem to comprise most of the terms of this sequence.
Up to n=500, the only indices for which a(n) is not of this form are n=2,...,16, 18, 34, 38, 43, 64, 83, 148, 158, 236, 266, 296, 310.
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LINKS
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M. F. Hasler, Table of n, a(n) for n=1,...,500.
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PROGRAM
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(PARI) t=0; A138850=vector(50, i, until( (t+=2)%5 & isA006037(t), ); t)
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CROSSREFS
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Cf. A006037 (weird numbers), A100696 (a puzzle).
Sequence in context: A045070 A095257 A113856 this_sequence A016113 A118380 A135639
Adjacent sequences: A138847 A138848 A138849 this_sequence A138851 A138852 A138853
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KEYWORD
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nonn
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AUTHOR
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M. F. Hasler (www.univ-ag.fr/~mhasler), Apr 02 2008
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