A267298 Integers k such that the k-th prime divides the product of the first k nonzero Jacobsthal numbers.
5, 11, 14, 21, 24, 30, 31, 36, 53, 54, 55, 60, 61, 63, 67, 68, 78, 84, 88, 95, 105, 110, 113, 115, 116, 117, 122, 124, 125, 131, 141, 152, 162, 164, 170, 174, 176, 177, 184, 185, 192, 196, 199, 204, 216, 226, 234, 245, 255, 260, 267, 273, 275, 279, 280, 304, 305, 316, 319, 324, 339, 349, 356, 358, 366
Offset: 1
Keywords
Examples
5 is a term because A001045(5) = 11 is divisible by 11.
Programs
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PARI
a001045(n) = (2^n - (-1)^n) / 3; lista(nn) = for(n=1, nn, my(p = prime(n)); if (lift(prod(i=1, n, Mod(a001045(i), p))) == 0, print1(n, ", ")));
Comments