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 A135285 Sum of staircase twin primes according to the rule: top * bottom - next top. 0
 10, 24, 126, 294, 858, 1704, 3528, 5082, 10296, 11526, 18894, 22320, 32208, 36666, 38976, 51744, 57330, 72618, 79212, 96996, 120684, 175968, 186162, 212922, 271914, 324300, 359382, 381282, 411504, 434790, 655278, 674856, 684726, 735282, 776904 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS While there is multiplication and subtraction in the generation of this sequence, it is still called a sum because the arithmetic processes -,*,/ are derived from addition. LINKS FORMULA We list the twin primes in staircase fashion as in A135283. Then a(n) = tl(n) * tu(n) + (-tl(n+1)). a(n) = A037074(n) -A001359(n+1). - R. J. Mathar, Sep 10 2016 PROG (PARI) g(n) = for(x=1, n, y=twinu(x) * twinl(x) - twinl(x+1); print1(y", ")) twinl(n) = / *The n-th lower twin prime. */ { local(c, x); c=0; x=1; while(c

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Last modified August 5 17:54 EDT 2021. Contains 346488 sequences. (Running on oeis4.)