A088173 -id:A088173 - cp's OEIS frontend

A088174 Numbers n such that n^2 appears in A088173.

1, 2, 4, 6, 18, 30, 36, 78, 90, 114, 120, 132, 138, 144, 150, 156, 162, 168, 192, 210, 216, 222, 246, 264, 288, 306, 312, 318, 336, 372, 396, 462, 564, 606, 624, 630, 642, 648, 654, 678, 714, 738, 774, 792, 810, 816, 840, 864, 918, 936, 1002, 1020, 1038, 1062

Offset: 1

Zak Seidov, Sep 22 2003

Cf. A087592, A088173.

Corrected and extended by Ray Chandler, Sep 25 2003

A278139 Primes, starting with a(1)=2, whose successive differences are increasing triangular numbers.

Original entry on oeis.org

2, 3, 13, 41, 107, 227, 503, 881, 1409, 2039, 2819, 3947, 5273, 6869, 8699, 11549, 15377, 19937, 24593, 30809, 38069, 47939, 58379, 69257, 82787, 98897, 115733, 133499, 152027, 172127, 192833, 218711, 247391, 279269, 315047, 355517, 399473, 444623

Offset: 1

Ivan N. Ianakiev, Nov 13 2016

Cf. A088173, A275030.

lst={1};p[1]=2;p[n_]:=p[n]=Module[{i=Last[lst]+1},
While[!PrimeQ[p[n-1]+i*(i-1)/2],i++];AppendTo[lst,i];p[n-1]+i*(i-1)/2];
p/@Range[50]

cp's OEIS Frontend

A088174 Numbers n such that n^2 appears in A088173.

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A278139 Primes, starting with a(1)=2, whose successive differences are increasing triangular numbers.

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Author

Keywords

Crossrefs

Programs

Mathematica