OFFSET
1,1
COMMENTS
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.
LINKS
Amiram Eldar, Table of n, a(n) for n = 1..10000 (terms 1..500 from M. F. Hasler)
PROG
(PARI) t=0; A138850=vector(50, i, until( (t+=2)%5 && is_A006037(t), ); t) \\ [Updated by M. F. Hasler, Jan 07 2014]
CROSSREFS
KEYWORD
nonn
AUTHOR
M. F. Hasler, Apr 02 2008
STATUS
approved