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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A225675 Numbers n such that triangular(n) is representable as p*w, where p is a prime number and w is a prime power (A025475).

Original entry on oeis.org

2, 7, 9, 16, 17, 18, 25, 26, 31, 53, 81, 97, 121, 127, 162, 241, 250, 256, 337, 361, 486, 577, 625, 841, 1249, 1458, 2186, 2401, 2662, 3361, 3481, 3697, 3721, 4373, 4801, 5041, 6241, 6961, 8191, 10201, 10657, 13121, 14641, 17161, 19321, 23761, 25537, 28561, 31249, 32257
Offset: 1

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Author

Alex Ratushnyak, May 12 2013

Keywords

Comments

Corresponding triangular numbers are in A225674.
The subsequence of even terms begins: 2, 16, 18, 26, 162, 250, 256, 486, 1458, 2186, 2662, 39366, 48778, 65536, 410758, 715822, 1594322, 2450086, 6615898, 12872686, 13935742, 15290746, 23394166, 38930218, 41022298, 86093442, ...

Crossrefs

Cf. A000040, A000217, A025475, A225674.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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