

A092859


"Difference" of the sequences of triangular numbers (A000217) and the primes (cf. A092858).


6



3, 4, 5, 7, 12, 13, 16, 18, 19, 22, 23, 30, 31, 38, 39, 40, 42, 43, 46, 48, 49, 50, 51, 52, 53, 56, 57, 58, 60, 61, 68, 69, 70, 72, 73, 80, 81, 82, 84, 85, 86, 87, 88, 89, 92, 93, 94, 95, 96, 98, 99, 100, 102, 103, 106, 108, 110, 111, 112, 113, 121, 122, 123, 124, 125, 126
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OFFSET

1,1


COMMENTS

Here the complement of the sequence of primes (1 and the composites) is "added" to the sequence of triangulars, according to the definition outlined in A092858.


LINKS

Table of n, a(n) for n=1..66.
Ferenc Adorjan, Binary mapping of monotonic sequences and the Aronson function


PROG

(PARI) {sdif(a, b)= /*Returns the "difference" of monotonic sequences a and b */ return(mtinv(mt(a)+mt(compl(b)))) /* the functions mt(a) and mtinv(r) are defined in A051006 and A092855, respectively */ } {compl(v)=/* Returns the complement of v monotonic positive sequence */ local(n, p=0, vv=[]); n=matsize(v)[2]; for(i=1, n, for(j=p+1, v[i]1, vv=concat (vv, j)); p=v[i]); return(vv)}


CROSSREFS

Cf. A092855, A051006, A092857, A092858, A092860, A092861, A092862, A092863, A092874.
Sequence in context: A300841 A023713 A032890 * A173444 A120424 A139440
Adjacent sequences: A092856 A092857 A092858 * A092860 A092861 A092862


KEYWORD

easy,nonn


AUTHOR

Ferenc Adorjan (fadorjan(AT)freemail.hu)


STATUS

approved



